net: Avoid using C-style NUL-terminated strings as arguments in the netbase interface

src/qt/optionsdialog.cpp

@@ -375,7 +375,7 @@ QValidator::State ProxyAddressValidator::validate(QString &input, int &pos) cons
 {
     Q_UNUSED(pos);
     // Validate the proxy
-    CService serv(LookupNumeric(input.toStdString().c_str(), DEFAULT_GUI_PROXY_PORT));
+    CService serv(LookupNumeric(input.toStdString(), DEFAULT_GUI_PROXY_PORT));
     proxyType addrProxy = proxyType(serv, true);
     if (addrProxy.IsValid())
         return QValidator::Acceptable;

src/qt/rpcconsole.cpp

@@ -1240,7 +1240,7 @@ void RPCConsole::unbanSelectedNode()
         QString strNode = nodes.at(i).data().toString();
         CSubNet possibleSubnet;
 
-        LookupSubNet(strNode.toStdString().c_str(), possibleSubnet);
+        LookupSubNet(strNode.toStdString(), possibleSubnet);
         if (possibleSubnet.IsValid() && m_node.unban(possibleSubnet))
         {
             clientModel->getBanTableModel()->refresh();