[U-Boot] [PATCH] envcrc: check return value of fwrite()

[Mike Frysinger]

Newer toolchains will often complain about unchecked fwrite():
	envcrc.c:117: warning: ignoring return value of ‘fwrite’, declared
		with attribute warn_unused_result

So check the return value to silence the warnings.

Signed-off-by: Mike Frysinger <vapier at gentoo.org>
---
 tools/envcrc.c |    4 +++-
 1 files changed, 3 insertions(+), 1 deletions(-)

diff --git a/tools/envcrc.c b/tools/envcrc.c
index d02a7db..d1e84b3 100644
--- a/tools/envcrc.c
+++ b/tools/envcrc.c
@@ -21,6 +21,7 @@
  * MA 02111-1307 USA
  */
 
+#include <errno.h>
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
@@ -114,7 +115,8 @@ int main (int argc, char **argv)
 			}
 			for (i = start; i != end; i += step)
 				printf("%c", (crc & (0xFF << (i * 8))) >> (i * 8));
-			fwrite(dataptr, 1, datasize, stdout);
+			if (fwrite(dataptr, 1, datasize, stdout) != datasize)
+				fprintf(stderr, "fwrite() failed: %s\n", strerror(errno));
 		} else {
 			printf("CRC32 from offset %08X to %08X of environment = %08X\n",
 				(unsigned int) (dataptr - envptr),
-- 
1.6.5.1