[media] Staging: cx25821: fix braces and space coding style issues

Errors found by the checkpatch.pl tool.

[mchehab@redhat.com: merged a series of CodingStyle cleanup patches for cx25851. They're all from the same author, and patches the same driver]
Signed-off-by: Ruslan Pisarev <ruslan@rpisarev.org.ua>
Cc: Palash Bandyopadhyay <Palash.Bandyopadhyay@conexant.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>