V4L/DVB (4418): Fix broken msp3400 module option 'standard'

Due to a wrong statement order the 'standard' module option didn't
work for 'G' model chips.

Signed-off-by: Hans Verkuil <hverkuil@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>