media: mediatek: vcodec: Handle invalid decoder vsi

commit 59d438f8 upstream.

Handle an invalid decoder vsi in vpu_dec_init to ensure the decoder vsi
is valid for future use.

Fixes: 590577a4 ("[media] vcodec: mediatek: Add Mediatek V4L2 Video Decoder Driver")

Signed-off-by: Irui Wang <irui.wang@mediatek.com>
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Sebastian Fricke <sebastian.fricke@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
[ Replace mtk_vdec_err with mtk_vcodec_err to make it work on 6.1.y ]
Signed-off-by: Alva Lan <alvalan9@foxmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>