Correct codedocs for rabbit WCF binding

and silence compiler warning about null comparison

Author: Emile Joubert

projects/examples/wcf/Test/App.config

@@ -52,7 +52,7 @@
 
   <appSettings>
     <add key="manual-test-broker-hostname" value="localhost"/>
-    <add key="manual-test-broker-port" value="5672"/>
+    <add key="manual-test-broker-port" value="-1"/>
     <add key="manual-test-broker-protocol" value="AMQP_0_9_1"/>
   </appSettings>
 </configuration>

projects/wcf/RabbitMQ.ServiceModel/src/serviceModel/RabbitMQBinding.cs

@@ -76,10 +76,11 @@ public RabbitMQBinding()
         { }
 
         /// <summary>
-        /// Uses the default protocol and the broker specified by the given
-        /// Uri.
+        /// Uses the broker specified by the given hostname and port with
+        /// Protocols.DefaultProtocol.
         /// </summary>
-        /// <param name="broker">The address of the broker to connect to</param>
+        /// <param name="hostname">The hostname of the broker to connect to</param>
+        /// <param name="port">The port of the broker to connect to</param>         
         public RabbitMQBinding(String hostname, int port)
             : this(hostname, port, Protocols.DefaultProtocol)
         { }

projects/wcf/RabbitMQ.ServiceModel/src/serviceModel/RabbitMQTransportBindingElement.cs

@@ -256,7 +256,7 @@ internal ConnectionFactory ConnectionFactory
                 {
                     connFactory.HostName = HostName;
                 }
-                if (Port != null)
+                if (Port != AmqpTcpEndpoint.UseDefaultPort)
                 {
                     connFactory.Port = Port;
                 }