fontselect: add overflow check
fontselect: add overflow check

xbmc/libass,ShiftMediaProject/libass,astiob/libass,MrSmile/libass,xbmc/libass,Akemi/libass,ShiftMediaProject/libass,libass/libass,astiob/libass,libass/libass,MrSmile/libass,Akemi/libass,Akemi/libass