V4L/DVB (6192): Ensure start_dma() is capable of starting dma on port VIDB

start_dma() would fail to start dma if a device used VIDB (portb).

Signed-off-by: Steven Toth <[email protected]>
Reviewed-by: Michael Krufky <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
2 files changed