sandbox_spl build warning

[Simon Glass]

Hi Marek,

I see this in CI for -next:

Building current source for 1 boards (0 threads, 64 jobs per thread)
   sandbox:  w+   sandbox_spl
+ 1159 |         fdt_test_header_get(uts, fdt, "magic", fdt_magic(fdt));
+      |         ^
+test/cmd/fdt.c:1159:9: note: referencing argument 2 of type ‘char *’
+test/cmd/fdt.c:1115:12: note: in a call to function ‘fdt_test_header_get’
+ 1115 | static int fdt_test_header_get(struct unit_test_state *uts,
char fdt[4096],
+      |            ^
+ 1160 |         fdt_test_header_get(uts, fdt, "totalsize", fdt_totalsize(fdt));

here:

https://source.denx.de/u-boot/custodians/u-boot-dm/-/jobs/591918

Could you please take a look?

Regards,
Simon