drm/vmwgfx: Don't promote updates from GMR-backed scanouts to fullscreen.

That's unnecessary since partial screen updates from GMRs are fast.
Also fix cliprect pointer dereferencing

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

drivers/gpu/drm/vmwgfx/vmwgfx_kms.c

@@ -553,9 +553,7 @@ int vmw_framebuffer_dmabuf_dirty(struct drm_framebuffer *framebuffer,
 	} *cmd;
 	int i, increment = 1;
 
-	if (!num_clips ||
-	    !(dev_priv->fifo.capabilities &
-	      SVGA_FIFO_CAP_SCREEN_OBJECT)) {
+	if (!num_clips) {
 		num_clips = 1;
 		clips = &norect;
 		norect.x1 = norect.y1 = 0;
@@ -574,10 +572,10 @@ int vmw_framebuffer_dmabuf_dirty(struct drm_framebuffer *framebuffer,
 
 	for (i = 0; i < num_clips; i++, clips += increment) {
 		cmd[i].header = cpu_to_le32(SVGA_CMD_UPDATE);
-		cmd[i].body.x = cpu_to_le32(clips[i].x1);
-		cmd[i].body.y = cpu_to_le32(clips[i].y1);
-		cmd[i].body.width = cpu_to_le32(clips[i].x2 - clips[i].x1);
-		cmd[i].body.height = cpu_to_le32(clips[i].y2 - clips[i].y1);
+		cmd[i].body.x = cpu_to_le32(clips->x1);
+		cmd[i].body.y = cpu_to_le32(clips->y1);
+		cmd[i].body.width = cpu_to_le32(clips->x2 - clips->x1);
+		cmd[i].body.height = cpu_to_le32(clips->y2 - clips->y1);
 	}
 
 	vmw_fifo_commit(dev_priv, sizeof(*cmd) * num_clips);