Fix a crash in lossless decoder.
Fix a crash in lossless decoder.

This was due to incorrect update of 'ok'.

Change-Id: I91edfb5682527e8bc7eaa10e635c0261edb016b6

kleopatra999/webm.libwebp,zofuthan/libwebp,webmproject/libwebp,iniwf/webm.libwebp,cysp/libwebp,imazen/libwebp,Tekserve/libwebp,Suvarna1488/webm.libwebp,Acidburn0zzz/webm.libwebp,kleopatra999/webm.libwebp,comoyo/gonzo-libwebp,jacklicn/libwebp,imazen/libwebp,abwiz0086/webm.libwebp,iniwf/webm.libwebp,dumganhar/libwebp,kalli123/webm.libwebp,imazen/libwebp,reimaginemedia/webm.libwebp,ya7lelkom/libwebp,comoyo/gonzo-libwebp,reimaginemedia/webm.libwebp,kleopatra999/webm.libwebp,matanbs/webm.libwebp,yohunl/libwebp,Distrotech/libwebp,ya7lelkom/libwebp,redengineer/libwebp,rxl194/libwebp,ericmckean/webm.libwebp,appunite/libwebp,appunite/libwebp,dumganhar/libwebp,kalli123/webm.libwebp,dumganhar/libwebp,PKRoma/libwebp,altogother/webm.libwebp,redengineer/libwebp,cysp/libwebp,Acidburn0zzz/webm.libwebp,Maria1099/webm.libwebp,rxl194/libwebp,altogother/webm.libwebp,zofuthan/libwebp,PKRoma/libwebp,kleopatra999/webm.libwebp,kim42083/webm.libwebp,ericmckean/webm.libwebp,comoyo/gonzo-libwebp,kalli123/webm.libwebp,Acidburn0zzz/webm.libwebp,ya7lelkom/libwebp,Acidburn0zzz/webm.libwebp,PKRoma/libwebp,ttyangf/libwebp,kim42083/webm.libwebp,gshORTON/webm.libwebp,Tekserve/libwebp,jiehu5114/libwebp,comoyo/gonzo-libwebp,iniwf/webm.libwebp,appunite/libwebp,Aexyn/libwebp,Maria1099/webm.libwebp,Aexyn/libwebp,Tekserve/libwebp,yohunl/libwebp,Suvarna1488/webm.libwebp,yohunl/libwebp,imazen/libwebp,abwiz0086/webm.libwebp,gshORTON/webm.libwebp,matanbs/webm.libwebp,kleopatra999/webm.libwebp,redengineer/libwebp,appunite/libwebp,jiehu5114/libwebp,Aexyn/libwebp,gshORTON/webm.libwebp,Distrotech/libwebp,PKRoma/libwebp,reimaginemedia/webm.libwebp,jacklicn/libwebp,ya7lelkom/libwebp,yohunl/libwebp,webmproject/libwebp,zofuthan/libwebp,jacklicn/libwebp,gshORTON/webm.libwebp,cysp/libwebp,ttyangf/libwebp,ttyangf/libwebp,Acidburn0zzz/webm.libwebp,zofuthan/libwebp,Distrotech/libwebp,Maria1099/webm.libwebp,yohunl/libwebp,ericmckean/webm.libwebp,kim42083/webm.libwebp,PKRoma/libwebp,reimaginemedia/webm.libwebp,rxl194/libwebp,ericmckean/webm.libwebp,imazen/libwebp,jacklicn/libwebp,ttyangf/libwebp,webmproject/libwebp,matanbs/webm.libwebp,keane83/BLE_IM,rxl194/libwebp,kalli123/webm.libwebp,abwiz0086/webm.libwebp,altogother/webm.libwebp,matanbs/webm.libwebp,altogother/webm.libwebp,kim42083/webm.libwebp,abwiz0086/webm.libwebp,keane83/BLE_IM,jacklicn/libwebp,matanbs/webm.libwebp,Aexyn/libwebp,Maria1099/webm.libwebp,appunite/libwebp,Suvarna1488/webm.libwebp,iniwf/webm.libwebp,Aexyn/libwebp,redengineer/libwebp,keane83/BLE_IM,reimaginemedia/webm.libwebp,ttyangf/libwebp,jiehu5114/libwebp,ericmckean/webm.libwebp,Maria1099/webm.libwebp,appunite/libwebp,comoyo/gonzo-libwebp,comoyo/gonzo-libwebp,iniwf/webm.libwebp,jiehu5114/libwebp,keane83/BLE_IM,keane83/BLE_IM,Tekserve/libwebp,webmproject/libwebp,PKRoma/libwebp,kalli123/webm.libwebp,ya7lelkom/libwebp,abwiz0086/webm.libwebp,zofuthan/libwebp,webmproject/libwebp,Suvarna1488/webm.libwebp,altogother/webm.libwebp,jiehu5114/libwebp,gshORTON/webm.libwebp,kim42083/webm.libwebp,cysp/libwebp,rxl194/libwebp,comoyo/gonzo-libwebp,Suvarna1488/webm.libwebp,redengineer/libwebp