Cleaning up vp9_firstpass.c.
Cleaning up vp9_firstpass.c.

Change-Id: Ic2ff6405f01fd43d07c5ee3b5e374909401115cc

thdav/aom,goodleixiao/vpx,matanbs/vp982,webmproject/libvpx,mwgoldsmith/libvpx,felipebetancur/libvpx,ittiamvpx/libvpx-1,shyamalschandra/libvpx,pcwalton/libvpx,thdav/aom,felipebetancur/libvpx,mbebenita/aom,matanbs/vp982,reimaginemedia/webm.libvpx,Laknot/libvpx,hsueceumd/test_hui,iniwf/webm.libvpx,Laknot/libvpx,kalli123/webm.libvpx,Topopiccione/libvpx,kleopatra999/webm.libvpx,lyx2014/libvpx_c,Topopiccione/libvpx,shacklettbp/aom,zofuthan/libvpx,ittiamvpx/libvpx-1,shareefalis/libvpx,VTCSecureLLC/libvpx,altogother/webm.libvpx,matanbs/webm.libvpx,mwgoldsmith/libvpx,kim42083/webm.libvpx,smarter/aom,shareefalis/libvpx,altogother/webm.libvpx,thdav/aom,shyamalschandra/libvpx,liqianggao/libvpx,openpeer/libvpx_new,running770/libvpx,abwiz0086/webm.libvpx,running770/libvpx,shareefalis/libvpx,mbebenita/aom,altogother/webm.libvpx,n4t/libvpx,pcwalton/libvpx,shyamalschandra/libvpx,shacklettbp/aom,reimaginemedia/webm.libvpx,Distrotech/libvpx,mwgoldsmith/vpx,smarter/aom,Distrotech/libvpx,webmproject/libvpx,goodleixiao/vpx,mwgoldsmith/vpx,GrokImageCompression/aom,Maria1099/webm.libvpx,kleopatra999/webm.libvpx,shacklettbp/aom,jmvalin/aom,hsueceumd/test_hui,running770/libvpx,iniwf/webm.libvpx,reimaginemedia/webm.libvpx,mbebenita/aom,jdm/libvpx,matanbs/webm.libvpx,ittiamvpx/libvpx,lyx2014/libvpx_c,mbebenita/aom,Suvarna1488/webm.libvpx,Acidburn0zzz/webm.libvpx,jmvalin/aom,Maria1099/webm.libvpx,ittiamvpx/libvpx,stewnorriss/libvpx,GrokImageCompression/aom,shacklettbp/aom,Suvarna1488/webm.libvpx,GrokImageCompression/aom,matanbs/vp982,Topopiccione/libvpx,hsueceumd/test_hui,mbebenita/aom,lyx2014/libvpx_c,running770/libvpx,jmvalin/aom,WebRTC-Labs/libvpx,mbebenita/aom,webmproject/libvpx,shyamalschandra/libvpx,felipebetancur/libvpx,openpeer/libvpx_new,webmproject/libvpx,jacklicn/webm.libvpx,pcwalton/libvpx,kim42083/webm.libvpx,webmproject/libvpx,charup/https---github.com-webmproject-libvpx-,thdav/aom,luctrudeau/aom,openpeer/libvpx_new,reimaginemedia/webm.libvpx,n4t/libvpx,gshORTON/webm.libvpx,jmvalin/aom,zofuthan/libvpx,shareefalis/libvpx,ittiamvpx/libvpx-1,shareefalis/libvpx,VTCSecureLLC/libvpx,Distrotech/libvpx,liqianggao/libvpx,abwiz0086/webm.libvpx,gshORTON/webm.libvpx,matanbs/vp982,Acidburn0zzz/webm.libvpx,luctrudeau/aom,pcwalton/libvpx,charup/https---github.com-webmproject-libvpx-,n4t/libvpx,jacklicn/webm.libvpx,smarter/aom,gshORTON/webm.libvpx,ShiftMediaProject/libvpx,pcwalton/libvpx,charup/https---github.com-webmproject-libvpx-,luctrudeau/aom,Suvarna1488/webm.libvpx,VTCSecureLLC/libvpx,kim42083/webm.libvpx,Maria1099/webm.libvpx,ShiftMediaProject/libvpx,liqianggao/libvpx,jmvalin/aom,stewnorriss/libvpx,openpeer/libvpx_new,jacklicn/webm.libvpx,matanbs/vp982,WebRTC-Labs/libvpx,ittiamvpx/libvpx,running770/libvpx,kleopatra999/webm.libvpx,Maria1099/webm.libvpx,gshORTON/webm.libvpx,n4t/libvpx,zofuthan/libvpx,iniwf/webm.libvpx,Topopiccione/libvpx,smarter/aom,kim42083/webm.libvpx,jacklicn/webm.libvpx,Acidburn0zzz/webm.libvpx,shyamalschandra/libvpx,matanbs/webm.libvpx,reimaginemedia/webm.libvpx,pcwalton/libvpx,gshORTON/webm.libvpx,felipebetancur/libvpx,kalli123/webm.libvpx,lyx2014/libvpx_c,GrokImageCompression/aom,mwgoldsmith/vpx,Maria1099/webm.libvpx,Laknot/libvpx,Maria1099/webm.libvpx,kalli123/webm.libvpx,matanbs/vp982,gshORTON/webm.libvpx,kleopatra999/webm.libvpx,hsueceumd/test_hui,smarter/aom,kim42083/webm.libvpx,liqianggao/libvpx,mwgoldsmith/libvpx,Acidburn0zzz/webm.libvpx,webmproject/libvpx,ittiamvpx/libvpx-1,iniwf/webm.libvpx,kalli123/webm.libvpx,Laknot/libvpx,altogother/webm.libvpx,matanbs/vp982,Distrotech/libvpx,lyx2014/libvpx_c,abwiz0086/webm.libvpx,thdav/aom,charup/https---github.com-webmproject-libvpx-,Acidburn0zzz/webm.libvpx,mwgoldsmith/vpx,Suvarna1488/webm.libvpx,charup/https---github.com-webmproject-libvpx-,shacklettbp/aom,WebRTC-Labs/libvpx,matanbs/webm.libvpx,mbebenita/aom,hsueceumd/test_hui,ittiamvpx/libvpx-1,stewnorriss/libvpx,kalli123/webm.libvpx,Distrotech/libvpx,abwiz0086/webm.libvpx,felipebetancur/libvpx,matanbs/webm.libvpx,jmvalin/aom,kalli123/webm.libvpx,ittiamvpx/libvpx,openpeer/libvpx_new,goodleixiao/vpx,Laknot/libvpx,Topopiccione/libvpx,altogother/webm.libvpx,mwgoldsmith/libvpx,mwgoldsmith/vpx,zofuthan/libvpx,shareefalis/libvpx,reimaginemedia/webm.libvpx,Distrotech/libvpx,Suvarna1488/webm.libvpx,Laknot/libvpx,charup/https---github.com-webmproject-libvpx-,stewnorriss/libvpx,shyamalschandra/libvpx,luctrudeau/aom,ShiftMediaProject/libvpx,kim42083/webm.libvpx,jdm/libvpx,GrokImageCompression/aom,luctrudeau/aom,jdm/libvpx,abwiz0086/webm.libvpx,VTCSecureLLC/libvpx,zofuthan/libvpx,goodleixiao/vpx,Suvarna1488/webm.libvpx,mbebenita/aom,abwiz0086/webm.libvpx,hsueceumd/test_hui,jacklicn/webm.libvpx,stewnorriss/libvpx,jdm/libvpx,stewnorriss/libvpx,WebRTC-Labs/libvpx,mbebenita/aom,VTCSecureLLC/libvpx,kleopatra999/webm.libvpx,mwgoldsmith/libvpx,VTCSecureLLC/libvpx,goodleixiao/vpx,luctrudeau/aom,n4t/libvpx,jacklicn/webm.libvpx,Acidburn0zzz/webm.libvpx,thdav/aom,iniwf/webm.libvpx,ittiamvpx/libvpx,ShiftMediaProject/libvpx,ittiamvpx/libvpx,ittiamvpx/libvpx-1,liqianggao/libvpx,mwgoldsmith/libvpx,jdm/libvpx,iniwf/webm.libvpx,ShiftMediaProject/libvpx,matanbs/webm.libvpx,running770/libvpx,Topopiccione/libvpx,lyx2014/libvpx_c,GrokImageCompression/aom,felipebetancur/libvpx,jdm/libvpx,altogother/webm.libvpx,liqianggao/libvpx,shacklettbp/aom,kleopatra999/webm.libvpx,goodleixiao/vpx,smarter/aom,zofuthan/libvpx,openpeer/libvpx_new,WebRTC-Labs/libvpx,mwgoldsmith/vpx