media: mtk-vcodec: Fix an error handling path in 'mtk_vcodec_probe()'

In case of error the 'media_device_init()' call is not balanced by a
corresponding 'media_device_cleanup()' call.

Add it, when needed, as already done in the remove function.

Fixes: 118add98 ("media: mtk-vcodec: vdec: add media device if using stateless api")
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Acked-by: Tzung-Bi Shih <tzungbi@google.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/mtk-vcodec/mtk_vcodec_dec_drv.c

@@ -358,6 +358,8 @@ static int mtk_vcodec_probe(struct platform_device *pdev)
 	if (dev->vdec_pdata->uses_stateless_api)
 		v4l2_m2m_unregister_media_controller(dev->m2m_dev_dec);
 err_reg_cont:
+	if (dev->vdec_pdata->uses_stateless_api)
+		media_device_cleanup(&dev->mdev_dec);
 	destroy_workqueue(dev->decode_workqueue);
 err_event_workq:
 	v4l2_m2m_release(dev->m2m_dev_dec);