Build failure under Fedora 33

[felixonmars]

cd /builddir/build/BUILD/ukui-screensaver-3.0.1/src && /usr/bin/g++ -DQT_CORE_LIB -DQT_DBUS_LIB -DQT_GUI_LIB -DQT_WIDGETS_LIB -DQT_X11EXTRAS_LIB -I/builddir/build/BUILD/ukui-screensaver-3.0.1/src -I/builddir/build/BUILD/ukui-screensaver-3.0.1 -I/builddir/build/BUILD/ukui-screensaver-3.0.1/VirtualKeyboard/src -I/builddir/build/BUILD/ukui-screensaver-3.0.1/BiometricAuth -I/builddir/build/BUILD/ukui-screensaver-3.0.1/Common -I/usr/include/qt5/QGSettings -isystem /usr/include/qt5 -isystem /usr/include/qt5/QtCore -isystem /usr/lib64/qt5/mkspecs/linux-g++ -isystem /usr/include/qt5/QtWidgets -isystem /usr/include/qt5/QtGui -isystem /usr/include/qt5/QtDBus -isystem /usr/include/qt5/QtX11Extras -O2 -flto=auto -ffat-lto-objects -fexceptions -g -grecord-gcc-switches -pipe -Wall -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -Wp,-D_GLIBCXX_ASSERTIONS -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -fstack-protector-strong -specs=/usr/lib/rpm/redhat/redhat-annobin-cc1  -m64 -mtune=generic -fasynchronous-unwind-tables -fstack-clash-protection -fcf-protection -g -fPIC -std=gnu++11 -o CMakeFiles/ukui-screensaver-dialog.dir/fullbackgroundwidget.cpp.o -c /builddir/build/BUILD/ukui-screensaver-3.0.1/src/fullbackgroundwidget.cpp
/builddir/build/BUILD/ukui-screensaver-3.0.1/src/fullbackgroundwidget.cpp: In function 'int switch_to_linux(const char*)':
/builddir/build/BUILD/ukui-screensaver-3.0.1/src/fullbackgroundwidget.cpp:101:16: error: ordered comparison of pointer with integer zero ('int (*)(int, const sockaddr*, socklen_t)' {aka 'int (*)(int, const sockaddr*, unsigned int)'} and 'int')
  101 |     if(connect < 0)
      |        ~~~~~~~~^~~