drm: use kvfree() in drm_free_large()

Use kvfree() instead of open-coding it.
Signed-off-by: Pekka Enberg <penberg@kernel.org>
Cc: David Airlie <airlied@linux.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/drm/drm_mem_util.h

@@ -56,10 +56,7 @@ static __inline__ void *drm_malloc_ab(size_t nmemb, size_t size)
 
 static __inline void drm_free_large(void *ptr)
 {
-	if (!is_vmalloc_addr(ptr))
-		return kfree(ptr);
-
-	vfree(ptr);
+	kvfree(ptr);
 }
 
 #endif