[media] Staging: tm6000: Delete braces from return in tm6000-cards.c

This is a patch to the tm6000-cards.c file that fixed up
a space error found by the checkpatch.pl tools.

Signed-off-by: Ruslan Pisarev <ruslan@rpisarev.org.ua>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>