fixed cpp lint issue in vp9_postproc_x86
fixed cpp lint issue in vp9_postproc_x86

Change-Id: I2b2af1dd9f5c29c05e28a4fd51fa58ccc4071477

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TON/webm.libvpx,liqianggao/libvpx,zofuthan/libvpx,kalli123/webm.libvpx,Laknot/libvpx,openpeer/libvpx_new,Distrotech/libvpx,sanyaade-teachings/libvpx,hsueceumd/test_hui,ittiamvpx/libvpx,mbebenita/aom,matanbs/vp982,WebRTC-Labs/libvpx,matanbs/webm.libvpx,shyamalschandra/libvpx,jmvalin/aom,Maria1099/webm.libvpx,GrokImageCompression/aom,kleopatra999/webm.libvpx,reimaginemedia/webm.libvpx,pcwalton/libvpx,mwgoldsmith/libvpx,GrokImageCompression/aom,stewnorriss/libvpx,mbebenita/aom,Laknot/libvpx,mwgoldsmith/libvpx,zofuthan/libvpx,kleopatra999/webm.libvpx,smarter/aom,GrokImageCompression/aom,jdm/libvpx,jdm/libvpx,felipebetancur/libvpx,stewnorriss/libvpx,Distrotech/libvpx,running770/libvpx,GrokImageCompression/aom