drm/msm: Nuke dummy fb->dirty callback

It's an optional hook.

Cc: Rob Clark <robdclark@gmail.com>
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1464630800-30786-22-git-send-email-daniel.vetter@ffwll.ch

drivers/gpu/drm/msm/msm_fb.c

@@ -56,17 +56,9 @@ static void msm_framebuffer_destroy(struct drm_framebuffer *fb)
 	kfree(msm_fb);
 }
 
-static int msm_framebuffer_dirty(struct drm_framebuffer *fb,
-		struct drm_file *file_priv, unsigned flags, unsigned color,
-		struct drm_clip_rect *clips, unsigned num_clips)
-{
-	return 0;
-}
-
 static const struct drm_framebuffer_funcs msm_framebuffer_funcs = {
 	.create_handle = msm_framebuffer_create_handle,
 	.destroy = msm_framebuffer_destroy,
-	.dirty = msm_framebuffer_dirty,
 };
 
 #ifdef CONFIG_DEBUG_FS