Revert "[media] v4l2-ioctl: simplify code"

There are some issues rised on this patch during patch review.
I ended by merging this one by mistake. So, let's revert it.

This reverts commit 54ace1cf.

Cc: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>