coretext: don't forget to release font format attribute
coretext: don't forget to release font format attribute

Akemi/libass,astiob/libass,MrSmile/libass,grigorig/libass,astiob/libass,stps/libass,mwgoldsmith/libass,ShiftMediaProject/libass,grigorig/libass,xbmc/libass,MrSmile/libass,ShiftMediaProject/libass,libass/libass,stps/libass,mwgoldsmith/libass,libass/libass,mwgoldsmith/libass,Akemi/libass,Akemi/libass,xbmc/libass,stps/libass