drm/gma500/psb: Fix cursor gem obj referencing on psb

The internal crtc cursor gem object pointer was never set/updated since
it was required to be set in the first place.

Fixing this will make the pin/unpin count match and prevent cursor
objects from leaking when userspace drops all references to it. Also
make sure we drop the gem obj reference on failure.

This patch only affects Poulsbo chips.

Signed-off-by: Patrik Jakobsson <[e-mail]>

drivers/gpu/drm/gma500/psb_intel_display.c

···
 	struct gtt_range *cursor_gt = psb_intel_crtc->cursor_gt;
 	struct drm_gem_object *obj;
 	void *tmp_dst, *tmp_src;
-	int ret, i, cursor_pages;
+	int ret = 0, i, cursor_pages;
 
 	/* if we want to turn of the cursor ignore width and height */
 	if (!handle) {
···
 
 	if (obj->size < width * height * 4) {
 		dev_dbg(dev->dev, "buffer is to small\n");
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto unref_cursor;
 	}
 
 	gt = container_of(obj, struct gtt_range, gem);
···
 	ret = psb_gtt_pin(gt);
 	if (ret) {
 		dev_err(dev->dev, "Can not pin down handle 0x%x\n", handle);
-		return ret;
+		goto unref_cursor;
 	}
 
 	if (dev_priv->ops->cursor_needs_phys) {
 		if (cursor_gt == NULL) {
 			dev_err(dev->dev, "No hardware cursor mem available");
-			return -ENOMEM;
+			ret = -ENOMEM;
+			goto unref_cursor;
 		}
 
 		/* Prevent overflow */
···
 							struct gtt_range, gem);
 		psb_gtt_unpin(gt);
 		drm_gem_object_unreference(psb_intel_crtc->cursor_obj);
-		psb_intel_crtc->cursor_obj = obj;
 	}
-	return 0;
+
+	psb_intel_crtc->cursor_obj = obj;
+	return ret;
+
+unref_cursor:
+	drm_gem_object_unreference(obj);
+	return ret;
 }
 
 static int psb_intel_crtc_cursor_move(struct drm_crtc *crtc, int x, int y)