* source/portknock.c : move func definition

src/sources/portknock.c

@@ -31,6 +31,12 @@ struct _config {
   f2b_port_t *current;
 };
 
+static void
+errcb_stub(char *str) {
+  assert(str != NULL);
+  (void)(str);
+}
+
 static bool
 try_parse_listen_opt(f2b_port_t *port, const char *value) {
   char buf[256];
@@ -66,12 +72,6 @@ try_parse_listen_opt(f2b_port_t *port, const char *value) {
   return false;
 }
 
-static void
-errcb_stub(char *str) {
-  assert(str != NULL);
-  (void)(str);
-}
-
 cfg_t *
 create(const char *init) {
   cfg_t *cfg = NULL;