Fix two gcc warnings.
Fix two gcc warnings.

Patch by Grigori G (greg chown ath cx).

git-svn-id: 947b4ff483bb4cc5004120385d99e48ac0944466@28751 b3059339-0415-0410-9bf9-f77b7e298cf2

grigorig/libass,Distrotech/libass,sanyaade-g2g-repos/libass,tgoyne/libass,sanyaade-g2g-repos/libass,torque/libass,grigorig/libass,tgoyne/libass,mwgoldsmith/libass,blinkseb/libass,vault/libass,pigoz/libass-ct,asimonov-im/libass,vault/libass,blinkseb/libass,MrSmile/libass,pigoz/libass-ct,libass/libass,richardpl/libass,rhlee/libass,stps/libass,tgoyne/libass,astiob/libass,astiob/libass,xbmc/libass,Akemi/libass,blinkseb/libass,rhlee/libass,richardpl/libass,asimonov-im/libass,torque/libass,ShiftMediaProject/libass,xbmc/libass,Distrotech/libass,stps/libass,MrSmile/libass,stps/libass,Akemi/libass,pigoz/libass-ct,Distrotech/libass,mwgoldsmith/libass,sanyaade-g2g-repos/libass,richardpl/libass,libass/libass,torque/libass,rhlee/libass,ShiftMediaProject/libass,Akemi/libass,mwgoldsmith/libass