Fix a msvc warning
Fix a msvc warning

Change-Id: Id5b8f597fb275395232559fea7bfeb56912b88a1

openpeer/libvpx_new,openpeer/libvpx_new,ShiftMediaProject/libvpx,smarter/aom,luctrudeau/aom,luctrudeau/aom,thdav/aom,mbebenita/aom,jmvalin/aom,jmvalin/aom,ittiamvpx/libvpx-1,thdav/aom,shacklettbp/aom,luctrudeau/aom,webmproject/libvpx,mwgoldsmith/libvpx,ShiftMediaProject/libvpx,luctrudeau/aom,mwgoldsmith/libvpx,luctrudeau/aom,mwgoldsmith/vpx,mwgoldsmith/vpx,thdav/aom,webmproject/libvpx,mwgoldsmith/libvpx,ittiamvpx/libvpx-1,mwgoldsmith/vpx,shacklettbp/aom,jmvalin/aom,Topopiccione/libvpx,ShiftMediaProject/libvpx,shacklettbp/aom,mwgoldsmith/vpx,mbebenita/aom,thdav/aom,ittiamvpx/libvpx-1,Topopiccione/libvpx,luctrudeau/aom,webmproject/libvpx,openpeer/libvpx_new,smarter/aom,openpeer/libvpx_new,shacklettbp/aom,Topopiccione/libvpx,ittiamvpx/libvpx-1,jmvalin/aom,smarter/aom,ShiftMediaProject/libvpx,Topopiccione/libvpx,ShiftMediaProject/libvpx,webmproject/libvpx,GrokImageCompression/aom,GrokImageCompression/aom,mbebenita/aom,thdav/aom,ittiamvpx/libvpx-1,openpeer/libvpx_new,mwgoldsmith/libvpx,webmproject/libvpx,Topopiccione/libvpx,mbebenita/aom,smarter/aom,mbebenita/aom,jmvalin/aom,mwgoldsmith/libvpx,GrokImageCompression/aom,openpeer/libvpx_new,webmproject/libvpx,thdav/aom,GrokImageCompression/aom,GrokImageCompression/aom,mwgoldsmith/vpx,shacklettbp/aom,smarter/aom,jmvalin/aom,ittiamvpx/libvpx-1,mbebenita/aom,mbebenita/aom,shacklettbp/aom,mbebenita/aom,mwgoldsmith/libvpx,mwgoldsmith/vpx,mbebenita/aom,GrokImageCompression/aom,smarter/aom,Topopiccione/libvpx