start_dma() would fail to start dma if a device used VIDB (portb).
Signed-off-by: NSteven Toth <stoth@hauppauge.com>
Reviewed-by: NMichael Krufky <mkrufky@linuxtv.org>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>