Fixed infinite loop when receiving a SETTINGS frame.

jetty-http2/http2-client/src/test/java/org/eclipse/jetty/http2/client/FlowControlTest.java

@@ -103,7 +103,7 @@ public class FlowControlTest extends AbstractTest
             }
         });
 
-        // Two SETTINGS frames, the initial one and the one we send.
+        // Two SETTINGS frames, the initial one and the one we send from the server.
         final CountDownLatch settingsLatch = new CountDownLatch(2);
         Session client = newClient(new Session.Listener.Adapter()
         {

jetty-http2/http2-common/src/main/java/org/eclipse/jetty/http2/HTTP2Session.java

@@ -163,6 +163,10 @@ public abstract class HTTP2Session implements ISession, Parser.Listener
     {
         if (LOG.isDebugEnabled())
             LOG.debug("Received {}", frame);
+
+        if (frame.isReply())
+            return false;
+
         Map<Integer, Integer> settings = frame.getSettings();
         if (settings.containsKey(SettingsFrame.MAX_CONCURRENT_STREAMS))
         {