Using v4l_printk_ioctl saves a lot of code duplication. Also moved a few
ioctl cases to another function, improving the ioctl grouping.
Signed-off-by: NHans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>