[media] siano: Properly initialize board information

Board #0 is an existing one. Instead of initializing the driver
with it, use a different value to detect if board is unknown.

Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
diff --git a/drivers/media/common/siano/smscoreapi.c b/drivers/media/common/siano/smscoreapi.c
index bc15dce..1dab4b6 100644
--- a/drivers/media/common/siano/smscoreapi.c
+++ b/drivers/media/common/siano/smscoreapi.c
@@ -723,6 +723,7 @@
 	sms_info("allocated %d buffers", dev->num_buffers);
 
 	dev->mode = DEVICE_MODE_NONE;
+	dev->board_id = SMS_BOARD_UNKNOWN;
 	dev->context = params->context;
 	dev->device = params->device;
 	dev->setmode_handler = params->setmode_handler;