Fix arithmetic overflow warnings.
Fix arithmetic overflow warnings.

Change-Id: Ib85b5bc135aa0907a76b8c74faafe577e27d014f

iniwf/webm.libvpx,zofuthan/libvpx,kleopatra999/webm.libvpx,zofuthan/libvpx,reimaginemedia/webm.libvpx,shacklettbp/aom,mwgoldsmith/vpx,felipebetancur/libvpx,Maria1099/webm.libvpx,kleopatra999/webm.libvpx,mwgoldsmith/vpx,altogother/webm.libvpx,mbebenita/aom,zofuthan/libvpx,jmvalin/aom,kalli123/webm.libvpx,goodleixiao/vpx,kalli123/webm.libvpx,shacklettbp/aom,running770/libvpx,liqianggao/libvpx,reimaginemedia/webm.libvpx,kim42083/webm.libvpx,shacklettbp/aom,running770/libvpx,kim42083/webm.libvpx,shareefalis/libvpx,mbebenita/aom,smarter/aom,iniwf/webm.libvpx,mbebenita/aom,zofuthan/libvpx,abwiz0086/webm.libvpx,luctrudeau/aom,felipebetancur/libvpx,mwgoldsmith/libvpx,Maria1099/webm.libvpx,ShiftMediaProject/libvpx,gshORTON/webm.libvpx,liqianggao/libvpx,kalli123/webm.libvpx,shacklettbp/aom,openpeer/libvpx_new,Distrotech/libvpx,shyamalschandra/libvpx,goodleixiao/vpx,zofuthan/libvpx,GrokImageCompression/aom,mbebenita/aom,liqianggao/libvpx,iniwf/webm.libvpx,kleopatra999/webm.libvpx,ShiftMediaProject/libvpx,Distrotech/libvpx,GrokImageCompression/aom,mbebenita/aom,mwgoldsmith/libvpx,kalli123/webm.libvpx,altogother/webm.libvpx,thdav/aom,liqianggao/libvpx,matanbs/webm.libvpx,kleopatra999/webm.libvpx,Suvarna1488/webm.libvpx,smarter/aom,gshORTON/webm.libvpx,openpeer/libvpx_new,ShiftMediaProject/libvpx,openpeer/libvpx_new,Topopiccione/libvpx,gshORTON/webm.libvpx,webmproject/libvpx,ittiamvpx/libvpx-1,felipebetancur/libvpx,jmvalin/aom,jacklicn/webm.libvpx,shareefalis/libvpx,goodleixiao/vpx,thdav/aom,goodleixiao/vpx,VTCSecureLLC/libvpx,openpeer/libvpx_new,mbebenita/aom,gshORTON/webm.libvpx,jacklicn/webm.libvpx,webmproject/libvpx,Acidburn0zzz/webm.libvpx,running770/libvpx,lyx2014/libvpx_c,Suvarna1488/webm.libvpx,mbebenita/aom,thdav/aom,Suvarna1488/webm.libvpx,Topopiccione/libvpx,shareefalis/libvpx,kleopatra999/webm.libvpx,kalli123/webm.libvpx,shyamalschandra/libvpx,stewnorriss/libvpx,gshORTON/webm.libvpx,altogother/webm.libvpx,shareefalis/libvpx,abwiz0086/webm.libvpx,shareefalis/libvpx,running770/libvpx,shyamalschandra/libvpx,jmvalin/aom,luctrudeau/aom,Distrotech/libvpx,luctrudeau/aom,liqianggao/libvpx,shyamalschandra/libvpx,mwgoldsmith/vpx,zofuthan/libvpx,VTCSecureLLC/libvpx,luctrudeau/aom,gshORTON/webm.libvpx,shyamalschandra/libvpx,reimaginemedia/webm.libvpx,smarter/aom,mwgoldsmith/vpx,shacklettbp/aom,webmproject/libvpx,lyx2014/libvpx_c,smarter/aom,Maria1099/webm.libvpx,jmvalin/aom,Suvarna1488/webm.libvpx,lyx2014/libvpx_c,Acidburn0zzz/webm.libvpx,goodleixiao/vpx,stewnorriss/libvpx,Topopiccione/libvpx,Distrotech/libvpx,VTCSecureLLC/libvpx,kim42083/webm.libvpx,stewnorriss/libvpx,reimaginemedia/webm.libvpx,kalli123/webm.libvpx,jacklicn/webm.libvpx,matanbs/webm.libvpx,thdav/aom,kim42083/webm.libvpx,webmproject/libvpx,abwiz0086/webm.libvpx,smarter/aom,iniwf/webm.libvpx,VTCSecureLLC/libvpx,ittiamvpx/libvpx-1,Distrotech/libvpx,openpeer/libvpx_new,thdav/aom,stewnorriss/libvpx,ittiamvpx/libvpx-1,Suvarna1488/webm.libvpx,ittiamvpx/libvpx-1,goodleixiao/vpx,GrokImageCompression/aom,Distrotech/libvpx,altogother/webm.libvpx,GrokImageCompression/aom,VTCSecureLLC/libvpx,Topopiccione/libvpx,jmvalin/aom,lyx2014/libvpx_c,Acidburn0zzz/webm.libvpx,Acidburn0zzz/webm.libvpx,stewnorriss/libvpx,webmproject/libvpx,shareefalis/libvpx,altogother/webm.libvpx,altogother/webm.libvpx,matanbs/webm.libvpx,kim42083/webm.libvpx,Maria1099/webm.libvpx,mwgoldsmith/vpx,felipebetancur/libvpx,Maria1099/webm.libvpx,ShiftMediaProject/libvpx,ittiamvpx/libvpx-1,felipebetancur/libvpx,VTCSecureLLC/libvpx,kim42083/webm.libvpx,Suvarna1488/webm.libvpx,iniwf/webm.libvpx,smarter/aom,luctrudeau/aom,running770/libvpx,jacklicn/webm.libvpx,Acidburn0zzz/webm.libvpx,GrokImageCompression/aom,Topopiccione/libvpx,running770/libvpx,webmproject/libvpx,jacklicn/webm.libvpx,abwiz0086/webm.libvpx,matanbs/webm.libvpx,Acidburn0zzz/webm.libvpx,reimaginemedia/webm.libvpx,kleopatra999/webm.libvpx,lyx2014/libvpx_c,mbebenita/aom,matanbs/webm.libvpx,felipebetancur/libvpx,luctrudeau/aom,mwgoldsmith/libvpx,GrokImageCompression/aom,lyx2014/libvpx_c,shacklettbp/aom,jmvalin/aom,reimaginemedia/webm.libvpx,iniwf/webm.libvpx,jacklicn/webm.libvpx,Topopiccione/libvpx,mwgoldsmith/libvpx,mwgoldsmith/vpx,stewnorriss/libvpx,abwiz0086/webm.libvpx,thdav/aom,mbebenita/aom,liqianggao/libvpx,shyamalschandra/libvpx,abwiz0086/webm.libvpx,matanbs/webm.libvpx,mwgoldsmith/libvpx,openpeer/libvpx_new,ittiamvpx/libvpx-1,ShiftMediaProject/libvpx,mwgoldsmith/libvpx,Maria1099/webm.libvpx