Some more compiler warnings fixed.

src/app/application.cpp

@@ -264,7 +264,7 @@ void Application::runExternalProgram(BitTorrent::TorrentHandle *const torrent) c
 #elif defined(Q_OS_WIN)  // test cmd: `echo "%F" > "c:\ab ba.txt"`
     program.prepend(QLatin1String("\"")).append(QLatin1String("\""));
     program.prepend(Utils::Misc::windowsSystemPath() + QLatin1String("\\cmd.exe /C "));
-    const uint cmdMaxLength = 32768;  // max length (incl. terminate char) for `lpCommandLine` in `CreateProcessW()`
+    const int cmdMaxLength = 32768;  // max length (incl. terminate char) for `lpCommandLine` in `CreateProcessW()`
     if ((program.size() + 1) > cmdMaxLength) {
         logger->addMessage(tr("Torrent: %1, run external program command too long (length > %2), execution failed.").arg(torrent->name()).arg(cmdMaxLength), Log::CRITICAL);
         return;

src/base/bittorrent/session.cpp

@@ -1104,8 +1104,6 @@ void Session::adjustLimits(libt::session_settings &sessionSettings)
 
 void Session::configure(libtorrent::session_settings &sessionSettings)
 {
-    Logger* const logger = Logger::instance();
-
     const bool altSpeedLimitEnabled = isAltGlobalSpeedLimitEnabled();
     sessionSettings.download_rate_limit = altSpeedLimitEnabled ? altGlobalDownloadSpeedLimit() : globalDownloadSpeedLimit();
     sessionSettings.upload_rate_limit = altSpeedLimitEnabled ? altGlobalUploadSpeedLimit() : globalUploadSpeedLimit();