drm/bridge/analogix/anx78xx: Cleanup on error in anx78xx_bridge_attach()

Just another issue I noticed while correcting usages of
drm_dp_aux_init()/drm_dp_aux_register() around the tree. If any of the
steps in anx78xx_bridge_attach() fail, we end up leaking resources. So,
let's fix that (and fix leaking a DP AUX adapter in the process) by
unrolling on errors.
Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210219215326.2227596-10-lyude@redhat.com

drivers/gpu/drm/bridge/analogix/analogix-anx78xx.c

@@ -918,7 +918,7 @@ static int anx78xx_bridge_attach(struct drm_bridge *bridge,
 				 DRM_MODE_CONNECTOR_DisplayPort);
 	if (err) {
 		DRM_ERROR("Failed to initialize connector: %d\n", err);
-		return err;
+		goto aux_unregister;
 	}
 
 	drm_connector_helper_add(&anx78xx->connector,
@@ -930,16 +930,21 @@ static int anx78xx_bridge_attach(struct drm_bridge *bridge,
 					   bridge->encoder);
 	if (err) {
 		DRM_ERROR("Failed to link up connector to encoder: %d\n", err);
-		return err;
+		goto connector_cleanup;
 	}
 
 	err = drm_connector_register(&anx78xx->connector);
 	if (err) {
 		DRM_ERROR("Failed to register connector: %d\n", err);
-		return err;
+		goto connector_cleanup;
 	}
 
 	return 0;
+connector_cleanup:
+	drm_connector_cleanup(&anx78xx->connector);
+aux_unregister:
+	drm_dp_aux_unregister(&anx78xx->aux);
+	return err;
 }
 
 static void anx78xx_bridge_detach(struct drm_bridge *bridge)