mount: add a missing return on a error path

Signed-off-by: Andrew Vagin <avagin@virtuozzo.com>
Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>

criu/mount.c

@@ -2548,6 +2548,7 @@ static int do_bind_mount(struct mount_info *mi)
 		if (mount(mnt_path, mnt_clean_path, NULL, MS_BIND, NULL)) {
 			pr_perror("Unable to bind-mount %s to %s",
 					mi->bind->mountpoint, mnt_clean_path);
+			return -1;
 		}
 		mnt_path = mnt_clean_path;
 		umount_mnt_path = true;