trivial warn_unused_result squashing

Made the mistake of recompiling the F9 mdadm rpm which has a patch to
remove -Werror and add "-Wp,-D_FORTIFY_SOURCE -O2" which turns on lots
of errors:

config.c:568: warning: ignoring return value of asprintf
Assemble.c:411: warning: ignoring return value of asprintf
Assemble.c:413: warning: ignoring return value of asprintf
super0.c:549: warning: ignoring return value of posix_memalign
super0.c:742: warning: ignoring return value of posix_memalign
super0.c:812: warning: ignoring return value of posix_memalign
super1.c:692: warning: ignoring return value of posix_memalign
super1.c:1039: warning: ignoring return value of posix_memalign
super1.c:1155: warning: ignoring return value of posix_memalign
super-ddf.c:508: warning: ignoring return value of posix_memalign
super-ddf.c:645: warning: ignoring return value of posix_memalign
super-ddf.c:696: warning: ignoring return value of posix_memalign
super-ddf.c:715: warning: ignoring return value of posix_memalign
super-ddf.c:1476: warning: ignoring return value of posix_memalign
super-ddf.c:1603: warning: ignoring return value of posix_memalign
super-ddf.c:1614: warning: ignoring return value of posix_memalign
super-ddf.c:1842: warning: ignoring return value of posix_memalign
super-ddf.c:2013: warning: ignoring return value of posix_memalign
super-ddf.c:2140: warning: ignoring return value of write
super-ddf.c:2143: warning: ignoring return value of write
super-ddf.c:2147: warning: ignoring return value of write
super-ddf.c:2150: warning: ignoring return value of write
super-ddf.c:2162: warning: ignoring return value of write
super-ddf.c:2169: warning: ignoring return value of write
super-ddf.c:2172: warning: ignoring return value of write
super-ddf.c:2176: warning: ignoring return value of write
super-ddf.c:2181: warning: ignoring return value of write
super-ddf.c:2686: warning: ignoring return value of posix_memalign
super-ddf.c:2690: warning: ignoring return value of write
super-ddf.c:3070: warning: ignoring return value of posix_memalign
super-ddf.c:3254: warning: ignoring return value of posix_memalign
bitmap.c:128: warning: ignoring return value of posix_memalign
mdmon.c:94: warning: ignoring return value of write
mdmon.c:221: warning: ignoring return value of pipe
mdmon.c:327: warning: ignoring return value of write
mdmon.c:330: warning: ignoring return value of chdir
mdmon.c:335: warning: ignoring return value of dup
monitor.c:415: warning: rv may be used uninitialized in this function

...some of these like the write() ones are not so trivial so save those
fixes for the next patch.

Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/bitmap.c b/bitmap.c
index 8617669..0f8a265 100644
--- a/bitmap.c
+++ b/bitmap.c
@@ -125,7 +125,10 @@ bitmap_info_t *bitmap_fd_read(int fd, int brief)
 	void *buf;
 	int n, skip;
 
-	posix_memalign(&buf, 512, 8192);
+	if (posix_memalign(&buf, 512, 8192) != 0) {
+		fprintf(stderr, Name ": failed to allocate 8192 bytes\n");
+		return NULL;
+	}
 	n = read(fd, buf, 8192);
 
 	info = malloc(sizeof(*info));