dm: remove unnecessary wrapper around blk_lld_busy

There is no need for DM to export a wrapper around the already exported
blk_lld_busy().

Signed-off-by: Mike Snitzer <snitzer@redhat.com>

drivers/md/dm-mpath.c

diff --git a/drivers/md/dm-mpath.c b/drivers/md/dm-mpath.c
index d376dc8..add6391 100644
--- a/drivers/md/dm-mpath.c
+++ b/drivers/md/dm-mpath.c
@@ -1627,7 +1627,7 @@
 {
 	struct request_queue *q = bdev_get_queue(pgpath->path.dev->bdev);
 
-	return dm_underlying_device_busy(q);
+	return blk_lld_busy(q);
 }
 
 /*

drivers/md/dm.c

diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index 0e5f344..e7095eb 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -2006,12 +2006,6 @@
 	dm_put_live_table(md, srcu_idx);
 }
 
-int dm_underlying_device_busy(struct request_queue *q)
-{
-	return blk_lld_busy(q);
-}
-EXPORT_SYMBOL_GPL(dm_underlying_device_busy);
-
 static int dm_lld_busy(struct request_queue *q)
 {
 	int r;