Fix some cppcheck warning

ktnef/src/qwmf.cpp

@@ -165,7 +165,6 @@ bool QWinMetaFile::load(QBuffer &buffer)
     WmfEnhMetaHeader eheader;
     WmfMetaHeader header;
     WmfPlaceableHeader pheader;
-    WORD checksum;
     int filePos, idx, i;
     WmfCmd *cmd, *last;
     DWORD rdSize;
@@ -194,7 +193,7 @@ bool QWinMetaFile::load(QBuffer &buffer)
         st >> pheader.inch;
         st >> pheader.reserved;
         st >> pheader.checksum;
-        checksum = calcCheckSum(&pheader);
+        const WORD checksum = calcCheckSum(&pheader);
         if (pheader.checksum != checksum) {
             mIsPlaceable = false;
         }

src/editor/potentialphishingemail/potentialphishingdetailwidget.cpp

@@ -15,6 +15,7 @@
 
 PotentialPhishingDetailWidget::PotentialPhishingDetailWidget(QWidget *parent)
     : QWidget(parent)
+    , mListWidget(new QListWidget(this))
 {
     QVBoxLayout *mainLayout = new QVBoxLayout(this);
     mainLayout->setContentsMargins(0, 0, 0, 0);
@@ -22,7 +23,6 @@ PotentialPhishingDetailWidget::PotentialPhishingDetailWidget(QWidget *parent)
     lab->setObjectName(QStringLiteral("label"));
     mainLayout->addWidget(lab);
 
-    mListWidget = new QListWidget(this);
     mListWidget->setObjectName(QStringLiteral("list_widget"));
     mainLayout->addWidget(mListWidget);
 }

src/editor/potentialphishingemail/potentialphishingdetailwidget.h

@@ -22,7 +22,7 @@ public:
 
     void fillList(const QStringList &lst);
 private:
-    QListWidget *mListWidget = nullptr;
+    QListWidget *const mListWidget = nullptr;
 };
 
 #endif // POTENTIALPHISHINGDETAILWIDGET_H

src/identity/identitypage.cpp

@@ -225,11 +225,11 @@ void IdentityPage::slotRemoveIdentity()
                                            KGuiItem(i18n("&Remove"),
                                                     QStringLiteral("edit-delete")))
         == KMessageBox::Continue) {
-        for (QTreeWidgetItem *item : selectedItems) {
+        for (QTreeWidgetItem *selecteditem : selectedItems) {
             IdentityListViewItem *identityItem = dynamic_cast<IdentityListViewItem *>(item);
             identityName = identityItem->identity().identityName();
             if (mIdentityManager->removeIdentity(identityName)) {
-                delete item;
+                delete selecteditem;
             }
             if (mIPage.mIdentityList->currentItem()) {
                 mIPage.mIdentityList->currentItem()->setSelected(true);