vp9_firstpass.c: fix unused static function
vp9_firstpass.c: fix unused static function

Change-Id: Ia989a01d79f1f02defbeccb1b8eee23fdf5e764e

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