Fix potential crash in address parsing code.

src/detect-engine-address.c

@@ -389,7 +389,7 @@ int DetectAddressInsert(DetectEngineCtx *de_ctx, DetectAddressHead *gh,
                         DetectAddress *new)
 {
     DetectAddress *head = NULL;
-    DetectPort *port = new->port;
+    DetectPort *port = NULL;
     DetectAddress *cur = NULL;
     DetectAddress *c = NULL;
     int r = 0;
@@ -397,6 +397,8 @@ int DetectAddressInsert(DetectEngineCtx *de_ctx, DetectAddressHead *gh,
     if (new == NULL)
         return 0;
 
+    port = new->port;
+
     BUG_ON(new->ip.family == 0 && !(new->flags & ADDRESS_FLAG_ANY));
 
     /* get our head ptr based on the address we want to insert */