media: chips-media: wave5: Add WARN_ON to check if dec_output_info is NULL

media: chips-media: wave5: Add WARN_ON to check if dec_output_info is NULL

The dec_output_info should not be a null pointer, WARN_ON around it to
indicates a driver issue.

Signed-off-by: Jackson Lee <jackson.lee@chipsnmedia.com>
Signed-off-by: Nas Chung <nas.chung@chipsnmedia.com>
Tested-by: Brandon Brnich <b-brnich@ti.com>
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>