[IRDA]: Fix nsc-ircc dongle_id input

<Original patch from Maik Broemme>

o [CRITICA] Don't Oops on invalid dongle-id in nsc-ircc driver
Signed-off-by: Jean Tourrilhes <jt@hpl.hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/irda/nsc-ircc.c

@@ -351,8 +351,9 @@ static int __init nsc_ircc_open(int i, chipio_t *info)
 	}
 	MESSAGE("IrDA: Registered device %s\n", dev->name);
 
-	/* Check if user has supplied the dongle id or not */
-	if (!dongle_id) {
+	/* Check if user has supplied a valid dongle id or not */
+	if ((dongle_id <= 0) ||
+	    (dongle_id >= (sizeof(dongle_types) / sizeof(dongle_types[0]))) ) {
 		dongle_id = nsc_ircc_read_dongle_id(self->io.fir_base);
 		
 		MESSAGE("%s, Found dongle: %s\n", driver_name,