fix spinlock usage in hysdn_log_close()

Fix incorrect spinlock use in hysdn_log_close().  The function declared a
spinlock on the stack and used it to 'protect' a shared driver structure.

The patch simply removes the useless code.
Signed-off-by: NMatthias Kaehlcke <matthias.kaehlcke@gmail.com>
Cc: Karsten Keil <kkeil@suse.de>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

drivers/isdn/hysdn/hysdn_proclog.c

@@ -297,8 +297,6 @@ hysdn_log_close(struct inode *ino, struct file *filep)
 	struct procdata *pd;
 	hysdn_card *card;
 	int retval = 0;
-	unsigned long flags;
-	spinlock_t hysdn_lock = SPIN_LOCK_UNLOCKED;
 
 	lock_kernel();
 	if ((filep->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_WRITE) {
@@ -308,7 +306,6 @@ hysdn_log_close(struct inode *ino, struct file *filep)
 		/* read access -> log/debug read, mark one further file as closed */
 
 		pd = NULL;
-		spin_lock_irqsave(&hysdn_lock, flags);
 		inf = *((struct log_data **) filep->private_data);	/* get first log entry */
 		if (inf)
 			pd = (struct procdata *) inf->proc_ctrl;	/* still entries there */
@@ -331,7 +328,6 @@ hysdn_log_close(struct inode *ino, struct file *filep)
 			inf->usage_cnt--;	/* decrement usage count for buffers */
 			inf = inf->next;
 		}
-		spin_unlock_irqrestore(&hysdn_lock, flags);
 
 		if (pd)
 			if (pd->if_used <= 0)	/* delete buffers if last file closed */