[CIFS] New POSIX locking code not setting rc properly to zero on successful

unlock in case where server does not support POSIX locks and nobrl is
not specified.
Signed-off-by: NSteve French <sfrench@us.ibm.com>

fs/cifs/file.c

@@ -752,6 +752,7 @@ int cifs_lock(struct file *file, int cmd, struct file_lock *pfLock)
 			int stored_rc = 0;
 			struct cifsLockInfo *li, *tmp;
 
+			rc = 0;
 			down(&fid->lock_sem);
 			list_for_each_entry_safe(li, tmp, &fid->llist, llist) {
 				if (pfLock->fl_start <= li->offset &&