drm/tidss: Use drm_for_each_bridge_in_chain()

Replace the manual encoder->bridge_chain walk with the
drm_for_each_bridge_in_chain() macro. Drivers should not touch the
bridge_chain field directly.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Jyri Sarha <jsarha@ti.com>
Tested-by: Jyri Sarha <jsarha@ti.com>
Signed-off-by: Jyri Sarha <jsarha@ti.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200222110718.26272-1-laurent.pinchart@ideasonboard.com

drivers/gpu/drm/tidss/tidss_encoder.c

@@ -32,7 +32,7 @@ static int tidss_encoder_atomic_check(struct drm_encoder *encoder,
 	 * bridge timings, or from the connector's display_info if no
 	 * bridge defines the timings.
 	 */
-	list_for_each_entry(bridge, &encoder->bridge_chain, chain_node) {
+	drm_for_each_bridge_in_chain(encoder, bridge) {
 		if (!bridge->timings)
 			continue;