media: c8sectpfe: Refactor load_c8sectpfe_fw

release_firmware() in the same function that it was requested. It is
more clear and makes smatch happy.

drivers/media/platform/st/sti/c8sectpfe/c8sectpfe-core.c:1146 load_c8sectpfe_fw() warn: 'fw' from request_firmware() not released on lines: 1125,1132.

Signed-off-by: Ricardo Ribalda <ribalda@chromium.org>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>