CIFS: Fix error handling in cifs_push_mandatory_locks

Cc: <stable@vger.kernel.org>
Signed-off-by: Pavel Shilovsky <pshilovsky@etersoft.ru>
Signed-off-by: Steve French <smfrench@gmail.com>

fs/cifs/file.c

@@ -917,7 +917,7 @@ cifs_push_mandatory_locks(struct cifsFileInfo *cfile)
 	if (!buf) {
 		mutex_unlock(&cinode->lock_mutex);
 		free_xid(xid);
-		return rc;
+		return -ENOMEM;
 	}
 
 	for (i = 0; i < 2; i++) {