gen_init_cpio: fixed fwrite warning

On compilers with security warnings enabled by default, we get:

usr/gen_init_cpio.c: In function ‘cpio_mkfile’:
usr/gen_init_cpio.c:357: warning: ignoring return value of ‘fwrite’,
                                  declared with attribute warn_unused_result

So check the return value and handle errors accordingly.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Michal Marek <mmarek@suse.cz>

1 files changed, 4 insertions, 1 deletions

diff --git a/usr/gen_init_cpio.c b/usr/gen_init_cpio.c
index 83b3dde1a83b..b2b3c2d1cf8b 100644
--- a/usr/gen_init_cpio.c
+++ b/usr/gen_init_cpio.c
@@ -354,7 +354,10 @@ static int cpio_mkfile(const char *name, const char *location,
                 push_pad();
 
                 if (size) {
-                        fwrite(filebuf, size, 1, stdout);
+                        if (fwrite(filebuf, size, 1, stdout) != 1) {
+                                fprintf(stderr, "writing filebuf failed\n");
+                                goto error;
+                        }
                         offset += size;
                         push_pad();
                 }