fix the BITS=8 case
fix the BITS=8 case

spotted by Måns Rullgård (mans at mansr dot com)
Change-Id: I4720dc2eeb645af894e396739be6fa11b5fe2739

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