V4L/DVB (9296): Patch to remove warning message during cx88-dvb compilation

Remove warning message during cx88-dvb compilation.
Also fixes double underline in function and struct names.

Signed-off-by: Igor M. Liplianin <liplianin@me.by>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>