fix double to float conversion warning
fix double to float conversion warning

introduced in:
 a792b91 fix the -g/O3 discrepancy for 32bit compile

Change-Id: I6a77223f237527eda4ee1d6eaa993351bd74f1d6

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