Fix Jetty client cannot receive the HTTP response body

Author: xhrg

apm-sniffer/apm-sdk-plugin/jetty-plugin/jetty-client-9.x-plugin/src/main/java/org/apache/skywalking/apm/plugin/jetty/v9/client/AsyncHttpRequestSendInterceptor.java

@@ -61,10 +61,10 @@ public void beforeMethod(EnhancedInstance objInst, Method method, Object[] allAr
         if (allArguments[0] instanceof Response.Listener) {
             Response.Listener callback = (Response.Listener) allArguments[0];
             allArguments[0] = new ResponseListenerWrapper(callback, ContextManager.capture());
-            return;
+        } else {
+            Response.CompleteListener callback = (Response.CompleteListener) allArguments[0];
+            allArguments[0] = new CompleteListenerWrapper(callback, ContextManager.capture());
         }
-        Response.CompleteListener callback = (Response.CompleteListener) allArguments[0];
-        allArguments[0] = new CompleteListenerWrapper(callback, ContextManager.capture());
     }
 
     @Override