Fixed the null

Author: jamtur01

riemann-java-client/src/test/java/riemann/java/client/tests/TcpClientTest.java

@@ -157,10 +157,11 @@ public void overloadTest() throws IOException, InterruptedException {
       final ArrayList<int[]> results = new ArrayList<int[]>();
       int state = -1;
       int count = 0;
-      long deadline = System.currentTimeMillis() + 2000;
+      long deadline = System.currentTimeMillis() + 10000;  // Increase timeout to 10 seconds
       for (IPromise<Msg> response : responses) {
         try {
-          if (null == response.deref(deadline - System.currentTimeMillis(),
+          long timeRemaining = Math.max(0, deadline - System.currentTimeMillis());
+          if (null == response.deref(timeRemaining,
                                      TimeUnit.MILLISECONDS)) {
             // Timeout
             if (state == -1) {