[CIFS] Change semaphore to mutex for cifs lock_sem

Originally at http://lkml.org/lkml/2006/9/2/86

The recent change to "allow Windows blocking locks to be cancelled via a
CANCEL_LOCK call" introduced a new semaphore in struct cifsFileInfo,
lock_sem.  However, semaphores used as mutexes are deprecated these days,
and there's no reason to add a new one to the kernel.  Therefore, convert
lock_sem to a struct mutex (and also fix one indentation glitch on one of
the lines changed anyway).

Signed-off-by: Roland Dreier <roland@digitalvampire.org>
Signed-off-by: Jan Engelhardt <jengelh@gmx.de>
Signed-off-by: Steve French <sfrench@us.ibm.com>

fs/cifs/dir.c

@@ -274,7 +274,7 @@ cifs_create(struct inode *inode, struct dentry *direntry, int mode,
 			pCifsFile->invalidHandle = FALSE;
 			pCifsFile->closePend     = FALSE;
 			init_MUTEX(&pCifsFile->fh_sem);
-			init_MUTEX(&pCifsFile->lock_sem);
+			mutex_init(&pCifsFile->lock_mutex);
 			INIT_LIST_HEAD(&pCifsFile->llist);
 			atomic_set(&pCifsFile->wrtPending,0);