Sanity check for underflow
Sanity check for underflow

Change-Id: I52dbdcbd02c344c6260f196afad30005d14d3ee0

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