Fix initialized-but-unused warnings in test code for Release builds.

src/qgcunittest/MockMavlinkFileServer.cc

@@ -97,6 +97,7 @@ void MockMavlinkFileServer::_openCommand(QGCUASFileManager::Request* request)
     
     size_t cchPath = strnlen((char *)request->data, sizeof(request->data));
     Q_ASSERT(cchPath != sizeof(request->data));
+    Q_UNUSED(connected); // Fix initialized-but-not-referenced warning on release builds
     path = (char *)request->data;
     
     // Check path against one of our known test cases

src/qgcunittest/TCPLoopBackServer.cc

@@ -45,6 +45,7 @@ void TCPLoopBackServer::run(void)
 
     bool connected = QObject::connect(_tcpServer, SIGNAL(newConnection()), this, SLOT(_newConnection()));
     Q_ASSERT(connected);
+    Q_UNUSED(connected); // Fix initialized-but-not-referenced warning on release builds
 
     Q_ASSERT(_tcpServer->listen(_hostAddress, _port));
 
@@ -59,6 +60,7 @@ void TCPLoopBackServer::_newConnection(void)
     Q_ASSERT(_tcpSocket);
     bool connected = QObject::connect(_tcpSocket, SIGNAL(readyRead()), this, SLOT(_readBytes()));
     Q_ASSERT(connected);
+    Q_UNUSED(connected); // Fix initialized-but-not-referenced warning on release builds
 }
 
 void TCPLoopBackServer::_readBytes(void)