vp9_find_mv_refs_idx: remove unused split_count
vp9_find_mv_refs_idx: remove unused split_count

variable was write only

Change-Id: I04b002178f66961836ee08fb60a05b91b54e91d8

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