At least make it look consistent

Author: darkl

src/net45/WampSharp/WAMP2/V2/Client/Session/WampSessionClient.cs

@@ -104,19 +104,22 @@ public void Welcome(long session, WelcomeDetails details)
 
         public void Abort(AbortDetails details, string reason)
         {
-            TrySetCloseEventArgs(SessionCloseType.Abort, details, reason);
-            ((IDisposable)mServerProxy).Dispose();
+            using (IDisposable proxy = mServerProxy as IDisposable)
+            {
+                TrySetCloseEventArgs(SessionCloseType.Abort, details, reason);
+            }
         }
 
         public void Goodbye(GoodbyeDetails details, string reason)
         {
-            if (!mGoodbyeSent)
+            using (IDisposable proxy = mServerProxy as IDisposable)
             {
-                mServerProxy.Goodbye(new GoodbyeDetails(), WampErrors.GoodbyeAndOut);
+                if (!mGoodbyeSent)
+                {
+                    mServerProxy.Goodbye(new GoodbyeDetails(), WampErrors.GoodbyeAndOut);
+                }
             }
 
-            ((IDisposable)mServerProxy).Dispose();
-
             TrySetCloseEventArgs(SessionCloseType.Goodbye, details, reason);
         }