media: mediatek: vcodec: Fix H264 multi stateless decoder smatch warning

commit 9be85491 upstream.

Fix a smatch static checker warning on vdec_h264_req_multi_if.c.
Which leads to a kernel crash when fb is NULL.

Fixes: 397edc70 ("media: mediatek: vcodec: add h264 decoder driver for mt8186")
Signed-off-by: Yunfei Dong <yunfei.dong@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>
[ drivers/media/platform/mediatek/vcodec/decoder/vdec/vdec_h264_req_multi_if.c
  is renamed from drivers/media/platform/mediatek/vcodec/vdec/vdec_h264_req_multi_if.c
  since 0934d375 ("media: mediatek: vcodec: separate decoder and encoder").
  The path is changed accordingly to apply the patch on 6.1.y. ]
Signed-off-by: Wenshan Lan <jetlan9@163.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>