btrfs-progs: fix scrub error return from pthread_mutex_lock

If pthread_mutex_lock() fails it returns the error in ret,
and does not set errno.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>

diff --git a/cmds-scrub.c b/cmds-scrub.c
index 91ace9c..b0fcde6 100644 (file)
--- a/cmds-scrub.c
+++ b/cmds-scrub.c
@@ -763,7 +763,7 @@ static int scrub_write_progress(pthread_mutex_t *m, const char *fsid,
 
        ret = pthread_mutex_lock(m);
        if (ret) {
-               err = -errno;
+               err = -ret;
                goto out;
        }