[U-Boot] Build warnings in libfdt

[Heinrich Schuchardt]

Hello Simon,

when building U-Boot HEAD with GCC 9.2.1 I get a bunch of build warnings
which I did not see before your recent libfdt update.

scripts/dtc/libfdt/fdt.c: In function ‘fdt_offset_ptr’:
scripts/dtc/libfdt/fdt.c:137:18: warning: comparison of integer
expressions of different signedness: ‘unsigned int’ and ‘int’
[-Wsign-compare]
   137 |   if ((absoffset < offset)
       |                  ^
scripts/dtc/libfdt/fdt.c:143:23: warning: comparison of integer
expressions of different signedness: ‘unsigned int’ and ‘int’
[-Wsign-compare]
   143 |   if (((offset + len) < offset)
       |                       ^
scripts/dtc/libfdt/fdt.c: In function ‘fdt_move’:
scripts/dtc/libfdt/fdt.c:307:25: warning: comparison of integer
expressions of different signedness: ‘uint32_t’ {aka ‘unsigned int’} and
‘int’ [-Wsign-compare]
   307 |  if (fdt_totalsize(fdt) > bufsize)
       |                         ^
scripts/dtc/libfdt/fdt_ro.c: In function ‘fdt_get_string’:
scripts/dtc/libfdt/fdt_ro.c:56:16: warning: comparison of integer
expressions of different signedness: ‘uint32_t’ {aka ‘unsigned int’} and
‘int32_t’ {aka ‘int’} [-Wsign-compare]
    56 |  if (absoffset >= totalsize)
       |                ^~
scripts/dtc/libfdt/fdt_ro.c:64:18: warning: comparison of integer
expressions of different signedness: ‘int’ and ‘uint32_t’ {aka ‘unsigned
int’} [-Wsign-compare]
    64 |    if (stroffset >= fdt_size_dt_strings(fdt))
       |                  ^~
scripts/dtc/libfdt/fdt_ro.c:71:21: warning: comparison of integer
expressions of different signedness: ‘int’ and ‘uint32_t’ {aka ‘unsigned
int’} [-Wsign-compare]
    71 |       || (stroffset < -fdt_size_dt_strings(fdt)))
       |                     ^
scripts/dtc/libfdt/fdt_ro.c:73:20: warning: comparison of integer
expressions of different signedness: ‘int’ and ‘size_t’ {aka ‘long
unsigned int’} [-Wsign-compare]
    73 |   if ((-stroffset) < len)
       |                    ^
scripts/dtc/libfdt/fdt_ro.c: In function ‘fdt_mem_rsv’:
scripts/dtc/libfdt/fdt_ro.c:164:17: warning: comparison of integer
expressions of different signedness: ‘int’ and ‘uint32_t’ {aka ‘unsigned
int’} [-Wsign-compare]
   164 |   if (absoffset < fdt_off_mem_rsvmap(fdt))
       |                 ^
scripts/dtc/libfdt/fdt_ro.c:166:17: warning: comparison of integer
expressions of different signedness: ‘int’ and ‘long unsigned int’
[-Wsign-compare]
   166 |   if (absoffset > fdt_totalsize(fdt) -
       |                 ^
scripts/dtc/libfdt/fdt_ro.c: In function ‘fdt_node_offset_by_phandle’:
scripts/dtc/libfdt/fdt_ro.c:682:33: warning: comparison of integer
expressions of different signedness: ‘uint32_t’ {aka ‘unsigned int’} and
‘int’ [-Wsign-compare]
   682 |  if ((phandle == 0) || (phandle == -1))
       |                                 ^~
scripts/dtc/libfdt/fdt_wip.c: In function
‘fdt_setprop_inplace_namelen_partial’:
scripts/dtc/libfdt/fdt_wip.c:26:14: warning: comparison of integer
expressions of different signedness: ‘int’ and ‘uint32_t’ {aka ‘unsigned
int’} [-Wsign-compare]
    26 |  if (proplen < (len + idx))
       |              ^
scripts/dtc/libfdt/fdt_sw.c: In function ‘fdt_grab_space_’:
scripts/dtc/libfdt/fdt_sw.c:105:20: warning: comparison of integer
expressions of different signedness: ‘size_t’ {aka ‘long unsigned int’}
and ‘int’ [-Wsign-compare]
   105 |  if ((offset + len < offset) || (offset + len > spaceleft))
       |                    ^
scripts/dtc/libfdt/fdt_sw.c:105:47: warning: comparison of integer
expressions of different signedness: ‘size_t’ {aka ‘long unsigned int’}
and ‘int’ [-Wsign-compare]
   105 |  if ((offset + len < offset) || (offset + len > spaceleft))
       |                                               ^
scripts/dtc/libfdt/fdt_sw.c: In function ‘fdt_create_with_flags’:
scripts/dtc/libfdt/fdt_sw.c:118:14: warning: comparison of integer
expressions of different signedness: ‘int’ and ‘long unsigned int’
[-Wsign-compare]
   118 |  if (bufsize < hdrsize)
       |              ^
scripts/dtc/libfdt/fdt_sw.c: In function ‘fdt_resize’:
scripts/dtc/libfdt/fdt_sw.c:164:28: warning: comparison of integer
expressions of different signedness: ‘size_t’ {aka ‘long unsigned int’}
and ‘int’ [-Wsign-compare]
   164 |  if ((headsize + tailsize) > bufsize)
       |                            ^
scripts/dtc/libfdt/fdt_sw.c: In function ‘fdt_add_string_’:
scripts/dtc/libfdt/fdt_sw.c:258:34: warning: comparison of integer
expressions of different signedness: ‘uint32_t’ {aka ‘unsigned int’} and
‘int’ [-Wsign-compare]
   258 |  if (fdt_totalsize(fdt) + offset < struct_top)
       |                                  ^
scripts/dtc/libfdt/fdt_strerror.c: In function ‘fdt_strerror’:
scripts/dtc/libfdt/fdt_strerror.c:51:18: warning: comparison of integer
expressions of different signedness: ‘int’ and ‘long unsigned int’
[-Wsign-compare]
    51 |  else if (errval > -FDT_ERRTABSIZE) {
       |                  ^
scripts/dtc/libfdt/fdt_overlay.c: In function
‘overlay_update_local_node_references’:
scripts/dtc/libfdt/fdt_overlay.c:253:17: warning: comparison of integer
expressions of different signedness: ‘int’ and ‘long unsigned int’
[-Wsign-compare]
   253 |   for (i = 0; i < (fixup_len / sizeof(uint32_t)); i++) {
       |                 ^

Best regards

Heinrich