drm/bridge/analogix/dp_core: Unregister DP AUX channel on error in analogix_dp_probe()

Just another drive-by fix I noticed while going through the tree to cleanup
DP aux adapter registration - make sure we unregister the DP AUX dev if
analogix_dp_probe() fails.
Signed-off-by: Lyude Paul <lyude@redhat.com>
Reviewed-by: Robert Foss <robert.foss@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20210219215326.2227596-14-lyude@redhat.com

drivers/gpu/drm/bridge/analogix/analogix_dp_core.c

@@ -1782,6 +1782,7 @@ int analogix_dp_bind(struct analogix_dp_device *dp, struct drm_device *drm_dev)
 
 err_disable_pm_runtime:
 	pm_runtime_disable(dp->dev);
+	drm_dp_aux_unregister(&dp->aux);
 
 	return ret;
 }