drm/omap: fix missing unref to fb's buf object

omap_fbdev_create() takes a reference to the fb's gem object with
omap_gem_get_paddr(). However, it never releases it with
omap_gem_put_paddr().

This patch adds the missing omap_gem_put_paddr() to omap_fbdev_free().
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/omap_fbdev.c

@@ -371,6 +371,9 @@ void omap_fbdev_free(struct drm_device *dev)
 
 	fbdev = to_omap_fbdev(priv->fbdev);
 
+	/* release the ref taken in omap_fbdev_create() */
+	omap_gem_put_paddr(fbdev->bo);
+
 	/* this will free the backing object */
 	if (fbdev->fb) {
 		drm_framebuffer_unregister_private(fbdev->fb);