misc/examples: handle return code for ksr_route_withindlg() in kemy python example

- closes GH #1117

(cherry picked from commit d678d095858271a0282b8a824840880f9994041b)

misc/examples/kemi/kamailio-basic-kemi-python.py

@@ -66,7 +66,8 @@ class kamailio:
             return 1;
 
         # handle requests within SIP dialogs
-        self.ksr_route_withindlg(msg);
+        if self.ksr_route_withindlg(msg)==-255 :
+            return 1;
 
         # -- only initial requests (no To tag)