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, 16 insertions, 4 deletions

diff --git a/super0.c b/super0.c
index 24ea009a..291ccdde 100644
--- a/super0.c
+++ b/super0.c
@@ -546,7 +546,10 @@ static int init_super0(struct supertype *st, mdu_array_info_t *info,
 	mdp_super_t *sb;
 	int spares;
 
-	posix_memalign((void**)&sb, 512, MD_SB_BYTES + sizeof(bitmap_super_t));
+	if (posix_memalign((void**)&sb, 512, MD_SB_BYTES + sizeof(bitmap_super_t)) != 0) {
+		fprintf(stderr, Name ": %s could not allocate superblock\n", __func__);
+		return 0;
+	}
 	memset(sb, 0, MD_SB_BYTES + sizeof(bitmap_super_t));
 
 	st->sb = sb;
@@ -739,8 +742,12 @@ static int compare_super0(struct supertype *st, struct supertype *tst)
 	if (second->md_magic != MD_SB_MAGIC)
 		return 1;
 	if (!first) {
-		posix_memalign((void**)&first, 512, 
-			       MD_SB_BYTES + sizeof(struct bitmap_super_s));
+		if (posix_memalign((void**)&first, 512, 
+			       MD_SB_BYTES + sizeof(struct bitmap_super_s)) != 0) {
+			fprintf(stderr, Name
+				": %s could not allocate superblock\n", __func__);
+			return 1;
+		}
 		memcpy(first, second, MD_SB_BYTES + sizeof(struct bitmap_super_s));
 		st->sb = first;
 		return 0;
@@ -809,7 +816,12 @@ static int load_super0(struct supertype *st, int fd, char *devname)
 		return 1;
 	}
 
-	posix_memalign((void**)&super, 512, MD_SB_BYTES + sizeof(bitmap_super_t)+512);
+	if (posix_memalign((void**)&super, 512,
+			   MD_SB_BYTES + sizeof(bitmap_super_t)+512) != 0) {
+		fprintf(stderr, Name
+			": %s could not allocate superblock\n", __func__);
+		return 1;
+	}
 
 	if (read(fd, super, sizeof(*super)) != MD_SB_BYTES) {
 		if (devname)