Fix memory leak produced by the \blur patch.
Fix memory leak produced by the \blur patch.

Patch by Grigori G (greg chown ath cx).

git-svn-id: 947b4ff483bb4cc5004120385d99e48ac0944466@28750 b3059339-0415-0410-9bf9-f77b7e298cf2

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