[tcp] Make XmppTcpTransportModule invoke notifyDataReceived()

Author: Flowdalic

smack-tcp/src/main/java/org/jivesoftware/smack/tcp/XmppTcpTransportModule.java

@@ -500,7 +500,10 @@ private void onChannelSelected(SelectableChannel selectedChannel, SelectionKey s
                     newInterestedOps |= SelectionKey.OP_WRITE;
                 }
 
-                callbackBytesRead += bytesRead;
+                if (bytesRead > 0) {
+                    callbackBytesRead += bytesRead;
+                    this.connectionInternal.notifyDataReceived();
+                }
 
                 ByteBuffer filteredIncomingBuffer = incomingBuffer;
                 for (ListIterator<XmppInputOutputFilter> it = connectionInternal.getXmppInputOutputFilterEndIterator(); it.hasPrevious();) {