Fix warning: "Unused non-trivial variable"

[-Wclazy-unused-non-trivial-variable]

Change-Id: Ia99c3de31fd92205f25624ab60e60370c1aa4538
Reviewed-by: Orgad Shaneh <orgads@gmail.com>
Reviewed-by: hjk <hjk@qt.io>

src/libs/ssh/sftptransfer.cpp

@@ -162,7 +162,6 @@ void SftpTransfer::doStart()
             QFileInfo fi(f.sourceFile);
             if (fi.isSymLink()) {
                 link = true;
-                const QString target = fi.dir().relativeFilePath(fi.symLinkTarget()); // see QTBUG-5817.
                 d->batchFile.write("-rm " + QtcProcess::quoteArgUnix(f.targetFile).toLocal8Bit()
                                    + '\n');
             }

src/plugins/debugger/breakpoint.cpp

@@ -291,7 +291,6 @@ void BreakpointParameters::updateFromGdbOutput(const GdbMi &bkpt)
     QString originalLocation;
     QString file;
     QString fullName;
-    QString internalId;
 
     enabled = true;
     pending = false;

src/plugins/debugger/qml/qmlengine.cpp

@@ -1847,7 +1847,6 @@ void QmlEnginePrivate::messageReceived(const QByteArray &data)
 
                     const QVariantList v8BreakpointIdList = breakData.value("breakpoints").toList();
                     for (const QVariant &breakpointId : v8BreakpointIdList) {
-                        const QString x = breakpointId.toString();
                         const QString responseId = QString::number(breakpointId.toInt());
                         Breakpoint bp = engine->breakHandler()->findBreakpointByResponseId(responseId);
                         QTC_ASSERT(bp, continue);

src/plugins/help/helpmanager.cpp

@@ -231,7 +231,6 @@ QMap<QString, QUrl> HelpManager::linksForKeyword(const QString &key)
 
 QMap<QString, QUrl> HelpManager::linksForIdentifier(const QString &id)
 {
-    QMap<QString, QUrl> empty;
     QTC_ASSERT(!d->m_needsSetup, return {});
     return d->m_helpEngine->linksForIdentifier(id);
 }

src/plugins/languageclient/languageclientsettings.cpp

@@ -144,9 +144,6 @@ LanguageClientSettingsPageWidget::LanguageClientSettingsPageWidget(LanguageClien
     m_view->setSelectionBehavior(QAbstractItemView::SelectItems);
     connect(m_view->selectionModel(), &QItemSelectionModel::currentChanged,
             this, &LanguageClientSettingsPageWidget::currentChanged);
-    auto mimeTypes = Utils::transform(Utils::allMimeTypes(), [](const Utils::MimeType &mimeType){
-        return mimeType.name();
-    });
     auto buttonLayout = new QVBoxLayout();
     auto addButton = new QPushButton(LanguageClientSettingsPage::tr("&Add"));
     connect(addButton, &QPushButton::pressed, this, &LanguageClientSettingsPageWidget::addItem);

src/plugins/nim/suggest/nimsuggest.cpp

@@ -49,7 +49,6 @@ void NimSuggest::setProjectFile(const QString &file)
     if (m_projectFile == file)
         return;
 
-    auto old = m_projectFile;
     m_projectFile = file;
     emit projectFileChanged(file);
 
@@ -66,7 +65,6 @@ void NimSuggest::setExecutablePath(const QString &path)
     if (m_executablePath == path)
         return;
 
-    auto old = m_executablePath;
     m_executablePath = path;
     emit executablePathChanged(path);