cifs: add FL_CLOSE to fl_flags mask in cifs_read_flock

FL_CLOSE is quite common when you close a file on which you hold a
lock. The spurious "Unknown lock flags" message in cFYI is
confusing in this case.

Reported-by: Alexander Bokovoy <abokovoy@redhat.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Reviewed-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/file.c

@@ -1173,7 +1173,8 @@ cifs_read_flock(struct file_lock *flock, __u32 *type, int *lock, int *unlock,
 	if (flock->fl_flags & FL_LEASE)
 		cFYI(1, "Lease on file - not implemented yet");
 	if (flock->fl_flags &
-	    (~(FL_POSIX | FL_FLOCK | FL_SLEEP | FL_ACCESS | FL_LEASE)))
+	    (~(FL_POSIX | FL_FLOCK | FL_SLEEP |
+	       FL_ACCESS | FL_LEASE | FL_CLOSE)))
 		cFYI(1, "Unknown lock flags 0x%x", flock->fl_flags);
 
 	*type = server->vals->large_lock_type;