rbd: get rid of rbd_{get,put}_dev()

The functions rbd_get_dev() and rbd_put_dev() are trivial wrappers
that add no value, and their existence suggests they may do more
than what they do.

Get rid of them.
Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Dan Mick <dan.mick@inktank.com>

drivers/block/rbd.c

@@ -290,16 +290,6 @@ static struct device rbd_root_dev = {
 #  define rbd_assert(expr)	((void) 0)
 #endif /* !RBD_DEBUG */
 
-static struct device *rbd_get_dev(struct rbd_device *rbd_dev)
-{
-	return get_device(&rbd_dev->dev);
-}
-
-static void rbd_put_dev(struct rbd_device *rbd_dev)
-{
-	put_device(&rbd_dev->dev);
-}
-
 static int rbd_dev_refresh(struct rbd_device *rbd_dev, u64 *hver);
 static int rbd_dev_v2_refresh(struct rbd_device *rbd_dev, u64 *hver);
 
@@ -311,7 +301,7 @@ static int rbd_open(struct block_device *bdev, fmode_t mode)
 		return -EROFS;
 
 	mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
-	rbd_get_dev(rbd_dev);
+	(void) get_device(&rbd_dev->dev);
 	set_device_ro(bdev, rbd_dev->mapping.read_only);
 	rbd_dev->open_count++;
 	mutex_unlock(&ctl_mutex);
@@ -326,7 +316,7 @@ static int rbd_release(struct gendisk *disk, fmode_t mode)
 	mutex_lock_nested(&ctl_mutex, SINGLE_DEPTH_NESTING);
 	rbd_assert(rbd_dev->open_count > 0);
 	rbd_dev->open_count--;
-	rbd_put_dev(rbd_dev);
+	put_device(&rbd_dev->dev);
 	mutex_unlock(&ctl_mutex);
 
 	return 0;