drm: drop drm_buf_t typedef

Signed-off-by: Dave Airlie <airlied@linux.ie>
diff --git a/drivers/char/drm/r128_drv.h b/drivers/char/drm/r128_drv.h
index 1e3deab..8eb302e 100644
--- a/drivers/char/drm/r128_drv.h
+++ b/drivers/char/drm/r128_drv.h
@@ -57,7 +57,7 @@
 
 typedef struct drm_r128_freelist {
 	unsigned int age;
-	drm_buf_t *buf;
+	struct drm_buf *buf;
 	struct drm_r128_freelist *next;
 	struct drm_r128_freelist *prev;
 } drm_r128_freelist_t;