kernel/relay.c: use kvfree() in relay_free_page_array()

Use kvfree() instead of open-coding it.

Signed-off-by: Pekka Enberg <penberg@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/kernel/relay.c b/kernel/relay.c
index e9dbaeb..0b4570c 100644
--- a/kernel/relay.c
+++ b/kernel/relay.c
@@ -81,10 +81,7 @@
  */
 static void relay_free_page_array(struct page **array)
 {
-	if (is_vmalloc_addr(array))
-		vfree(array);
-	else
-		kfree(array);
+	kvfree(array);
 }
 
 /**