V4L/DVB (11407): gspca - m5602-ov9650: Clean up ov9650_start() function.

Cleans some unnecessary temporary variable usage in the ov9650 start function.

Signed-off-by: Erik Andr?n <erik.andren@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>