erlang: Fix detecting event route

Ensure proper detect event route and lost connection in erl_reply.

modules/erlang/cnode.c

@@ -514,6 +514,7 @@ int csockfd_init(csockfd_handler_t *phandler, const ei_cnode *ec)
 
 	csocket_handler = phandler;
 
+	csockfd = 0;
 	return 0;
 }
 

modules/erlang/erl_api.c

@@ -236,9 +236,12 @@ int _impl_reply(const ei_x_buff *msg)
 
 	/* must be in call back / event route */
 
-	if (!enode) {
+	if (csockfd) {
 		LM_ERR("not in callback\n");
 		return -1;
+	} else if (!enode) {
+		LM_ERR("not connected\n");
+		return -1;
 	}
 	/* copy into reply */
 	if (enode->response.buffsz < msg->buffsz) {