[fix] Provide more feedback about whiptail exit status to user

setup/so-whiptail

@@ -118,11 +118,15 @@ whiptail_cancel() {
 }
 
 whiptail_check_exitstatus() {
-
-	if [ "$1" != 0 ]; then
-		whiptail_cancel
-	fi
-
+	case $1 in
+		1)
+			whiptail_cancel
+			;;
+		255)
+			whiptail --title "Security Onion Setup" --msgbox "Whiptail error occured, exiting. Check log for details." 8 75
+			exit
+			;;
+	esac
 }
 
 whiptail_create_admin_user() {