mtd: blktrans: kill BKL

It not needed, because I already added locking for all fops
methods.

Signed-off-by: Maxim Levitsky <[e-mail]>
Signed-off-by: Artem Bityutskiy <[e-mail]>
Signed-off-by: David Woodhouse <[e-mail]>

drivers/mtd/mtd_blkdevs.c

···
 	if (!dev)
 		return -ERESTARTSYS; /* FIXME: busy loop! -arnd*/
 
-	lock_kernel();
 	mutex_lock(&dev->lock);
 
 	if (dev->open++)
···
 unlock:
 	mutex_unlock(&dev->lock);
 	blktrans_dev_put(dev);
-	unlock_kernel();
 	return ret;
 }
 
···
 	if (!dev)
 		return ret;
 
-	lock_kernel();
 	mutex_lock(&dev->lock);
 
 	if (--dev->open)
···
 unlock:
 	mutex_unlock(&dev->lock);
 	blktrans_dev_put(dev);
-	unlock_kernel();
 	return ret;
 }
 
···
 	if (!dev)
 		return ret;
 
-	lock_kernel();
 	mutex_lock(&dev->lock);
 
 	if (!dev->mtd)
···
 	}
 unlock:
 	mutex_unlock(&dev->lock);
-	unlock_kernel();
 	blktrans_dev_put(dev);
 	return ret;
 }