CIFS: Separate protocol specific part from setlk

Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 9c2d85d..ed9b5a8 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -1357,8 +1357,8 @@
 		if (rc <= 0)
 			goto out;
 
-		rc = CIFSSMBLock(xid, tcon, netfid, current->tgid, length,
-				 flock->fl_start, 0, 1, type, wait_flag, 0);
+		rc = cifs_mandatory_lock(xid, cfile, flock->fl_start, length,
+					 type, 1, 0, wait_flag);
 		if (rc) {
 			kfree(lock);
 			goto out;