libblkid: improve test_blkid_devno, fix compiler warning [-Wunused-result]

Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/libblkid/src/devno.c b/libblkid/src/devno.c
index e7b254cfad3ae48e019d38b17cd45873b67fafb7..c54903566fb9a5d721cc78b6ee4ecf816f01fb83 100644 (file)
--- a/libblkid/src/devno.c
+++ b/libblkid/src/devno.c
@@ -370,7 +370,9 @@ int main(int argc, char** argv)
        free(devname);
 
        printf("Looking for whole-device for 0x%04llx\n", (long long)devno);
-       blkid_devno_to_wholedisk(devno, diskname, sizeof(diskname), &disk_devno);
+       if (blkid_devno_to_wholedisk(devno, diskname,
+                               sizeof(diskname), &disk_devno) == 0)
+               printf("found devno 0x%04llx as /dev/%s\n", (long long) disk_devno, diskname);
 
        return 0;
 }