[media] hdpvr: fix sparse warnings

drivers/media/usb/hdpvr/hdpvr-core.c:110:54: warning: incorrect type in argument 1 (different base types)
drivers/media/usb/hdpvr/hdpvr-core.c:112:39: warning: invalid assignment: +=
drivers/media/usb/hdpvr/hdpvr-core.c:304:26: warning: Using plain integer as NULL pointer

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
1 file changed