General cleanup inside vp9_bitstream.c.
General cleanup inside vp9_bitstream.c.

Change-Id: I0c57b90055a018d53c32b5e39d8e899a9a4d1c1b

stewnorriss/libvpx,mbebenita/aom,lyx2014/libvpx_c,matanbs/webm.libvpx,matanbs/vp982,hsueceumd/test_hui,reimaginemedia/webm.libvpx,stewnorriss/libvpx,mwgoldsmith/vpx,sanyaade-teachings/libvpx,VTCSecureLLC/libvpx,felipebetancur/libvpx,shacklettbp/aom,kim42083/webm.libvpx,jdm/libvpx,charup/https---github.com-webmproject-libvpx-,cinema6/libvpx,gshORTON/webm.libvpx,VTCSecureLLC/libvpx,lyx2014/libvpx_c,charup/https---github.com-webmproject-libvpx-,goodleixiao/vpx,Acidburn0zzz/webm.libvpx,altogother/webm.libvpx,ittiamvpx/libvpx,mwgoldsmith/vpx,matanbs/webm.libvpx,Distrotech/libvpx,Laknot/libvpx,zofuthan/libvpx,thdav/aom,goodleixiao/vpx,matanbs/webm.libvpx,mbebenita/aom,goodleixiao/vpx,running770/libvpx,WebRTC-Labs/libvpx,ittiamvpx/libvpx-1,GrokImageCompression/aom,VTCSecureLLC/libvpx,altogother/webm.libvpx,webmproject/libvpx,ShiftMediaProject/libvpx,sanyaade-teachings/libvpx,Suvarna1488/webm.libvpx,zofuthan/libvpx,jdm/libvpx,thdav/aom,felipebetancur/libvpx,lyx2014/libvpx_c,ittiamvpx/libvpx-1,felipebetancur/libvpx,Topopiccione/libvpx,shareefalis/libvpx,webmproject/libvpx,GrokImageCompression/aom,kleopatra999/webm.libvpx,turbulenz/libvpx,pcwalton/libvpx,smarter/aom,mbebenita/aom,turbulenz/libvpx,altogother/webm.libvpx,iniwf/webm.libvpx,jmvalin/aom,kalli123/webm.libvpx,zofuthan/libvpx,shareefalis/libvpx,hsueceumd/test_hui,matanbs/vp982,lyx2014/libvpx_c,Topopiccione/libvpx,Distrotech/libvpx,matanbs/vp982,webmproject/libvpx,shacklettbp/aom,mbebenita/aom,Acidburn0zzz/webm.libvpx,Distrotech/libvpx,jdm/libvpx,altogother/webm.libvpx,matanbs/webm.libvpx,cinema6/libvpx,sanyaade-teachings/libvpx,reimaginemedia/webm.libvpx,kalli123/webm.libvpx,mwgoldsmith/libvpx,kim42083/webm.libvpx,turbulenz/libvpx,running770/libvpx,liqianggao/libvpx,gshORTON/webm.libvpx,openpeer/libvpx_new,running770/libvpx,Maria1099/webm.libvpx,felipebetancur/libvpx,goodleixiao/vpx,mbebenita/aom,jacklicn/webm.libvpx,kalli123/webm.libvpx,smarter/aom,abwiz0086/webm.libvpx,goodleixiao/vpx,shareefalis/libvpx,VTCSecureLLC/libvpx,Distrotech/libvpx,pcwalton/libvpx,jdm/libvpx,charup/https---github.com-webmproject-libvpx-,kleopatra999/webm.libvpx,thdav/aom,Laknot/libvpx,shyamalschandra/libvpx,Acidburn0zzz/webm.libvpx,ShiftMediaProject/libvpx,matanbs/vp982,zofuthan/libvpx,n4t/libvpx,openpeer/libvpx_new,lyx2014/libvpx_c,Topopiccione/libvpx,iniwf/webm.libvpx,ittiamvpx/libvpx-1,GrokImageCompression/aom,mwgoldsmith/libvpx,kleopatra999/webm.libvpx,liqianggao/libvpx,luctrudeau/aom,running770/libvpx,kim42083/webm.libvpx,ShiftMediaProject/libvpx,felipebetancur/libvpx,ittiamvpx/libvpx,abwiz0086/webm.libvpx,shyamalschandra/libvpx,n4t/libvpx,openpeer/libvpx_new,gshORTON/webm.libvpx,cinema6/libvpx,GrokImageCompression/aom,shareefalis/libvpx,abwiz0086/webm.libvpx,webmproject/libvpx,abwiz0086/webm.libvpx,iniwf/webm.libvpx,kleopatra999/webm.libvpx,mwgoldsmith/libvpx,mbebenita/aom,liqianggao/libvpx,turbulenz/libvpx,Laknot/libvpx,shareefalis/libvpx,mbebenita/aom,goodleixiao/vpx,GrokImageCompression/aom,luctrudeau/aom,abwiz0086/webm.libvpx,WebRTC-Labs/libvpx,cinema6/libvpx,GrokImageCompression/aom,mbebenita/aom,smarter/aom,openpeer/libvpx_new,jacklicn/webm.libvpx,mwgoldsmith/libvpx,Maria1099/webm.libvpx,cinema6/libvpx,mwgoldsmith/vpx,gshORTON/webm.libvpx,running770/libvpx,Maria1099/webm.libvpx,altogother/webm.libvpx,Suvarna1488/webm.libvpx,Distrotech/libvpx,ShiftMediaProject/libvpx,reimaginemedia/webm.libvpx,matanbs/webm.libvpx,stewnorriss/libvpx,stewnorriss/libvpx,smarter/aom,webmproject/libvpx,shareefalis/libvpx,jacklicn/webm.libvpx,Acidburn0zzz/webm.libvpx,webmproject/libvpx,jacklicn/webm.libvpx,ittiamvpx/libvpx,shacklettbp/aom,kalli123/webm.libvpx,pcwalton/libvpx,abwiz0086/webm.libvpx,smarter/aom,jmvalin/aom,Acidburn0zzz/webm.libvpx,n4t/libvpx,Suvarna1488/webm.libvpx,Laknot/libvpx,ittiamvpx/libvpx,thdav/aom,Suvarna1488/webm.libvpx,turbulenz/libvpx,mwgoldsmith/libvpx,hsueceumd/test_hui,jdm/libvpx,stewnorriss/libvpx,shyamalschandra/libvpx,iniwf/webm.libvpx,luctrudeau/aom,zofuthan/libvpx,Laknot/libvpx,ittiamvpx/libvpx-1,iniwf/webm.libvpx,sanyaade-teachings/libvpx,iniwf/webm.libvpx,smarter/aom,altogother/webm.libvpx,shyamalschandra/libvpx,kleopatra999/webm.libvpx,stewnorriss/libvpx,shacklettbp/aom,matanbs/vp982,reimaginemedia/webm.libvpx,shyamalschandra/libvpx,mwgoldsmith/vpx,liqianggao/libvpx,charup/https---github.com-webmproject-libvpx-,jdm/libvpx,luctrudeau/aom,WebRTC-Labs/libvpx,Maria1099/webm.libvpx,VTCSecureLLC/libvpx,reimaginemedia/webm.libvpx,Topopiccione/libvpx,jmvalin/aom,turbulenz/libvpx,n4t/libvpx,kalli123/webm.libvpx,luctrudeau/aom,shyamalschandra/libvpx,jacklicn/webm.libvpx,Maria1099/webm.libvpx,kim42083/webm.libvpx,liqianggao/libvpx,mwgoldsmith/libvpx,Laknot/libvpx,jmvalin/aom,WebRTC-Labs/libvpx,ShiftMediaProject/libvpx,turbulenz/libvpx,Topopiccione/libvpx,hsueceumd/test_hui,thdav/aom,WebRTC-Labs/libvpx,jacklicn/webm.libvpx,charup/https---github.com-webmproject-libvpx-,zofuthan/libvpx,kim42083/webm.libvpx,openpeer/libvpx_new,mwgoldsmith/vpx,kalli123/webm.libvpx,matanbs/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