dm stats: Use kvfree() in dm_kvfree()

Use kvfree() instead of open-coding it.

Signed-off-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
diff --git a/drivers/md/dm-stats.c b/drivers/md/dm-stats.c
index f478a4c..492fe6a 100644
--- a/drivers/md/dm-stats.c
+++ b/drivers/md/dm-stats.c
@@ -160,10 +160,7 @@
 
 	free_shared_memory(alloc_size);
 
-	if (is_vmalloc_addr(ptr))
-		vfree(ptr);
-	else
-		kfree(ptr);
+	kvfree(ptr);
 }
 
 static void dm_stat_free(struct rcu_head *head)