Check for 0-3.

controller/atsamx70/block_atsamx70_pwm.c

@@ -94,7 +94,7 @@ static struct controller_block * block_atsamx70_pwm_create(char *name, int argc,
 	}
 
 	ch_nr = va_arg(ap, int);
-	if (ch_nr < 0 || ch_nr > 1) {
+	if (ch_nr < 0 || ch_nr > 3) {
 		log_send(LOG_T_ERROR, "%s: channel %d is not valid. (valid: 0-3)",
 		    name, ch_nr);
 		return NULL;