media: aspeed: fix error return code in aspeed_video_setup_video()

Fix to return a negative error code from the error handling
case instead of 0, as done elsewhere in this function.

Fixes: d2b4387f ("media: platform: Add Aspeed Video Engine driver")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Zhang Changzhong <zhangchangzhong@huawei.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>