vp9: Remove superfluous command.
vp9: Remove superfluous command.

- vpx_calloc is called on arf_not_zz above.
- Note The removed vpx_memset call had an issue with sizeof.

Change-Id: I86fd7a167d0a042e581e613e2a6c0b5e63073fc6

jmvalin/aom,Topopiccione/libvpx,WebRTC-Labs/libvpx,Topopiccione/libvpx,matanbs/vp982,kleopatra999/webm.libvpx,zofuthan/libvpx,stewnorriss/libvpx,kleopatra999/webm.libvpx,Maria1099/webm.libvpx,jmvalin/aom,goodleixiao/vpx,jdm/libvpx,mwgoldsmith/vpx,Acidburn0zzz/webm.libvpx,matanbs/vp982,lyx2014/libvpx_c,Distrotech/libvpx,abwiz0086/webm.libvpx,Topopiccione/libvpx,vasilvv/esvp8,ittiamvpx/libvpx-1,Acidburn0zzz/webm.libvpx,liqianggao/libvpx,Maria1099/webm.libvpx,stewnorriss/libvpx,VTCSecureLLC/libvpx,ShiftMediaProject/libvpx,mwgoldsmith/libvpx,running770/libvpx,Acidburn0zzz/webm.libvpx,Topopiccione/libvpx,vasilvv/esvp8,Topopiccione/libvpx,mbebenita/aom,smarter/aom,Suvarna1488/webm.libvpx,liqianggao/libvpx,jdm/libvpx,vasilvv/esvp8,luctrudeau/aom,running770/libvpx,ittiamvpx/libvpx-1,turbulenz/libvpx,ittiamvpx/libvpx,altogother/webm.libvpx,webmproject/libvpx,stewnorriss/libvpx,shyamalschandra/libvpx,ittiamvpx/libvpx,shareefalis/libvpx,felipebetancur/libvpx,jdm/libvpx,jdm/libvpx,matanbs/webm.libvpx,jmvalin/aom,kalli123/webm.libvpx,pcwalton/libvpx,kalli123/webm.libvpx,kalli123/webm.libvpx,turbulenz/libvpx,Suvarna1488/webm.libvpx,VTCSecureLLC/libvpx,hsueceumd/test_hui,pcwalton/libvpx,turbulenz/libvpx,reimaginemedia/webm.libvpx,lyx2014/libvpx_c,stewnorriss/libvpx,reimaginemedia/webm.libvpx,luctrudeau/aom,shareefalis/libvpx,reimaginemedia/webm.libvpx,jmvalin/aom,VTCSecureLLC/libvpx,WebRTC-Labs/libvpx,matanbs/vp982,lyx2014/libvpx_c,thdav/aom,abwiz0086/webm.libvpx,WebRTC-Labs/libvpx,mwgoldsmith/libvpx,Laknot/libvpx,matanbs/webm.libvpx,mwgoldsmith/vpx,n4t/libvpx,Distrotech/libvpx,hsueceumd/test_hui,sanyaade-teachings/libvpx,mwgoldsmith/vpx,zofuthan/libvpx,abwiz0086/webm.libvpx,felipebetancur/libvpx,thdav/aom,hsueceumd/test_hui,shareefalis/libvpx,sanyaade-teachings/libvpx,kleopatra999/webm.libvpx,felipebetancur/libvpx,turbulenz/libvpx,Topopiccione/libvpx,stewnorriss/libvpx,cinema6/libvpx,goodleixiao/vpx,shareefalis/libvpx,thdav/aom,turbulenz/libvpx,iniwf/webm.libvpx,VTCSecureLLC/libvpx,charup/https---github.com-webmproject-libvpx-,lyx2014/libvpx_c,webmproject/libvpx,felipebetancur/libvpx,thdav/aom,matanbs/vp982,n4t/libvpx,vasilvv/esvp8,jacklicn/webm.libvpx,luctrudeau/aom,Distrotech/libvpx,ittiamvpx/libvpx,n4t/libvpx,gshORTON/webm.libvpx,Distrotech/libvpx,jacklicn/webm.libvpx,shacklettbp/aom,kalli123/webm.libvpx,smarter/aom,openpeer/libvpx_new,GrokImageCompression/aom,luctrudeau/aom,openpeer/libvpx_new,webmproject/libvpx,smarter/aom,zofuthan/libvpx,mwgoldsmith/libvpx,mwgoldsmith/vpx,liqianggao/libvpx,kalli123/webm.libvpx,kim42083/webm.libvpx,mwgoldsmith/vpx,VTCSecureLLC/libvpx,matanbs/webm.libvpx,reimaginemedia/webm.libvpx,zofuthan/libvpx,vasilvv/esvp8,webmproject/libvpx,cinema6/libvpx,mwgoldsmith/vpx,hsueceumd/test_hui,matanbs/vp982,Suvarna1488/webm.libvpx,luctrudeau/aom,kim42083/webm.libvpx,shyamalschandra/libvpx,jacklicn/webm.libvpx,reimaginemedia/webm.libvpx,shacklettbp/aom,mbebenita/aom,Laknot/libvpx,smarter/aom,openpeer/libvpx_new,kleopatra999/webm.libvpx,hsueceumd/test_hui,gshORTON/webm.libvpx,altogother/webm.libvpx,thdav/aom,gshORTON/webm.libvpx,n4t/libvpx,WebRTC-Labs/libvpx,turbulenz/libvpx,n4t/libvpx,Maria1099/webm.libvpx,kim42083/webm.libvpx,liqianggao/libvpx,abwiz0086/webm.libvpx,ittiamvpx/libvpx-1,matanbs/webm.libvpx,liqianggao/libvpx,webmproject/libvpx,vasilvv/esvp8,Laknot/libvpx,shacklettbp/aom,lyx2014/libvpx_c,WebRTC-Labs/libvpx,liqianggao/libvpx,turbulenz/libvpx,lyx2014/libvpx_c,iniwf/webm.libvpx,shyamalschandra/libvpx,charup/https---github.com-webmproject-libvpx-,Suvarna1488/webm.libvpx,iniwf/webm.libvpx,altogother/webm.libvpx,felipebetancur/libvpx,luctrudeau/aom,jacklicn/webm.libvpx,kim42083/webm.libvpx,shacklettbp/aom,Laknot/libvpx,jacklicn/webm.libvpx,ShiftMediaProject/libvpx,Acidburn0zzz/webm.libvpx,charup/https---github.com-webmproject-libvpx-,goodleixiao/vpx,ittiamvpx/libvpx-1,Suvarna1488/webm.libvpx,pcwalton/libvpx,reimaginemedia/webm.libvpx,iniwf/webm.libvpx,mbebenita/aom,pcwalton/libvpx,turbulenz/libvpx,vasilvv/esvp8,goodleixiao/vpx,Maria1099/webm.libvpx,Laknot/libvpx,ittiamvpx/libvpx,kim42083/webm.libvpx,goodleixiao/vpx,matanbs/vp982,matanbs/vp982,shyamalschandra/libvpx,running770/libvpx,cinema6/libvpx,sanyaade-teachings/libvpx,abwiz0086/webm.libvpx,cinema6/libvpx,GrokImageCompression/aom,shareefalis/libvpx,GrokImageCompression/aom,cinema6/libvpx,charup/https---github.com-webmproject-libvpx-,GrokImageCompression/aom,ittiamvpx/libvpx,cinema6/libvpx,stewnorriss/libvpx,matanbs/webm.libvpx,jacklicn/webm.libvpx,openpeer/libvpx_new,mbebenita/aom,webmproject/libvpx,mbebenita/aom,GrokImageCompression/aom,zofuthan/libvpx,charup/https---github.com-webmproject-libvpx-,ShiftMediaProject/libvpx,mbebenita/aom,Distrotech/libvpx,openpeer/libvpx_new,pcwalton/libvpx,gshORTON/webm.libvpx,cinema6/libvpx,kleopatra999/webm.libvpx,shyamalschandra/libvpx,VTCSecureLLC/libvpx,Suvarna1488/webm.libvpx,kalli123/webm.libvpx,matanbs/webm.libvpx,running770/libvpx,sanyaade-teachings/libvpx,ittiamvpx/libvpx-1,kim42083/webm.libvpx,t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