drm/nouveau/gem: use kvfree() in u_free()

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>

drivers/gpu/drm/nouveau/nouveau_gem.c

@@ -555,10 +555,7 @@ nouveau_gem_pushbuf_validate(struct nouveau_channel *chan,
 static inline void
 u_free(void *addr)
 {
-	if (!is_vmalloc_addr(addr))
-		kfree(addr);
-	else
-		vfree(addr);
+	kvfree(addr);
 }
 
 static inline void *