[media] cx23885: Remove unused 'err:' labels to quiet compiler warning

The previous revert-commit, that affected cx23885-i2c.c, left some
unused labels that the compiler griped about.  Clean them up.

Signed-off-by: Andy Walls <awalls@md.metrocast.net>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>