Avoid warning on empty expressions

For some reason, Q_UNUSED includes already a semicolon, adding one
on the user side creates an additional empty statement.

Change-Id: I9c5e8fac381345a60792cb75e2938fd53958d3b0
Reviewed-by: Christian Stenger <christian.stenger@qt.io>

src/plugins/debugger/terminal.cpp

@@ -128,7 +128,7 @@ int Terminal::write(const QByteArray &msg)
 #ifdef DEBUGGER_USE_TERMINAL
     return ::write(m_masterFd, msg.constData(), msg.size());
 #else
-    Q_UNUSED(msg);
+    Q_UNUSED(msg)
     return -1;
 #endif
 }
@@ -164,7 +164,7 @@ void Terminal::onSlaveReaderActivated(int fd)
     if (got >= 0)
         stdOutReady(QString::fromUtf8(buffer));
 #else
-    Q_UNUSED(fd);
+    Q_UNUSED(fd)
 #endif
 }