Btrfs-progs: fix compile warning in is_ssd()

mkfs.c: In function ‘is_ssd’:
mkfs.c:1168:26: warning: ignoring return value of ‘blkid_devno_to_wholedisk’,
declared with attribute warn_unused_result [-Wunused-result]
  blkid_devno_to_wholedisk(devno, wholedisk, sizeof(wholedisk), NULL);

Signed-off-by: Wang Shilong <wangsl.fnst@cn.fujitsu.com>
Signed-off-by: David Sterba <dsterba@suse.cz>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

diff --git a/mkfs.c b/mkfs.c
index 69df39b..9ccb4ac 100644 (file)
--- a/mkfs.c
+++ b/mkfs.c
@@ -1150,6 +1150,7 @@ static int is_ssd(const char *file)
        dev_t devno;
        int fd;
        char rotational;
+       int ret;
 
        probe = blkid_new_probe_from_filename(file);
        if (!probe)
@@ -1161,7 +1162,12 @@ static int is_ssd(const char *file)
                return 0;
 
        /* Get whole disk name (not full path) for this devno */
-       blkid_devno_to_wholedisk(devno, wholedisk, sizeof(wholedisk), NULL);
+       ret = blkid_devno_to_wholedisk(devno,
+                       wholedisk, sizeof(wholedisk), NULL);
+       if (ret) {
+               blkid_free_probe(probe);
+               return 0;
+       }
 
        snprintf(sysfs_path, PATH_MAX, "/sys/block/%s/queue/rotational",
                 wholedisk);