Make id signed so we can't get an invalid pointer when we pass a negative

id.
Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Cc: Mauro Carvalho Chehab <mchehab@infradead.org>
Cc: Michael Krufky <mkrufky@kernellabs.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

drivers/media/dvb/siano/sms-cards.c

@@ -97,7 +97,7 @@ static struct sms_board sms_boards[] = {
 	},
 };
 
-struct sms_board *sms_get_board(int id)
+struct sms_board *sms_get_board(unsigned id)
 {
 	BUG_ON(id >= ARRAY_SIZE(sms_boards));
 

drivers/media/dvb/siano/sms-cards.h

@@ -81,7 +81,7 @@ struct sms_board {
 	int led_power, led_hi, led_lo, lna_ctrl, rf_switch;
 };
 
-struct sms_board *sms_get_board(int id);
+struct sms_board *sms_get_board(unsigned id);
 
 extern struct smscore_device_t *coredev;