types/flagtype: fix bug showing the default port value (shown in --help)
@@ -21,7 +21,12 @@ func PortValue(dst *uint16, defaultPort uint16) flag.Value {
return portValue{dst}
}
-func (p portValue) String() string { return fmt.Sprint(p.n) }
+func (p portValue) String() string {
+ if p.n == nil {
+ return ""
+ }
+ return fmt.Sprint(*p.n)
+}
func (p portValue) Set(v string) error {
if v == "" {
return errors.New("can't be the empty string")
