Remove unnecessary dqcoeff memset.
Remove unnecessary dqcoeff memset.

dqcoeff is set to be 0 on initialization. And set back to 0 after being
used everytime.

Change-Id: I32b8e149bba40a8d707849f737a8e49a691f319c

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