Fix FTBFS with GCC7 on arm

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

style/polish.cpp

@@ -339,7 +339,7 @@ void LiquidStyle::polish( const TQStyleControlElementData &ceData, ControlElemen
                int format, result;
                unsigned long n, left;
                result = XGetWindowProperty(tqt_xdisplay(), w->winId(), baghira_deco_design, 0L, 1L, False, XA_CARDINAL, &actual, &format, &n, &left, &data);
-               if (result != Success || data == None) // not found set design
+               if (result != Success || data == NULL) // not found set design
                {
             int tmp = optionHandler->wmDesign != Tiger ? optionHandler->wmDesign : Panther;
                   XChangeProperty(tqt_xdisplay(), w->winId(), baghira_deco_design, XA_CARDINAL, 32, PropModeReplace, (unsigned char *) &(tmp), 1L);