Sort variables dependency in read_uncompressed_header
Sort variables dependency in read_uncompressed_header

Remove a few repeated data structure reads from
read_uncompressed_header.

Change-Id: I6eb741b39f9415ad0aa4631dfbf4a1ace4eba56a

mwgoldsmith/vpx,luctrudeau/aom,mwgoldsmith/libvpx,luctrudeau/aom,goodleixiao/vpx,liqianggao/libvpx,zofuthan/libvpx,GrokImageCompression/aom,thdav/aom,goodleixiao/vpx,running770/libvpx,shacklettbp/aom,Topopiccione/libvpx,mwgoldsmith/libvpx,mwgoldsmith/libvpx,mbebenita/aom,VTCSecureLLC/libvpx,luctrudeau/aom,openpeer/libvpx_new,mbebenita/aom,mbebenita/aom,openpeer/libvpx_new,luctrudeau/aom,zofuthan/libvpx,thdav/aom,shacklettbp/aom,ShiftMediaProject/libvpx,thdav/aom,Topopiccione/libvpx,goodleixiao/vpx,shacklettbp/aom,ShiftMediaProject/libvpx,felipebetancur/libvpx,jmvalin/aom,stewnorriss/libvpx,openpeer/libvpx_new,ShiftMediaProject/libvpx,GrokImageCompression/aom,webmproject/libvpx,Topopiccione/libvpx,felipebetancur/libvpx,felipebetancur/libvpx,shyamalschandra/libvpx,jmvalin/aom,GrokImageCompression/aom,GrokImageCompression/aom,running770/libvpx,VTCSecureLLC/libvpx,luctrudeau/aom,stewnorriss/libvpx,liqianggao/libvpx,mwgoldsmith/vpx,shacklettbp/aom,jmvalin/aom,GrokImageCompression/aom,VTCSecureLLC/libvpx,felipebetancur/libvpx,smarter/aom,webmproject/libvpx,mbebenita/aom,mbebenita/aom,felipebetancur/libvpx,smarter/aom,jmvalin/aom,jmvalin/aom,zofuthan/libvpx,smarter/aom,mwgoldsmith/vpx,Topopiccione/libvpx,stewnorriss/libvpx,webmproject/libvpx,ittiamvpx/libvpx-1,thdav/aom,smarter/aom,ShiftMediaProject/libvpx,openpeer/libvpx_new,mbebenita/aom,Topopiccione/libvpx,openpeer/libvpx_new,openpeer/libvpx_new,zofuthan/libvpx,webmproject/libvpx,liqianggao/libvpx,Topopiccione/libvpx,shyamalschandra/libvpx,mwgoldsmith/vpx,ittiamvpx/libvpx-1,shyamalschandra/libvpx,goodleixiao/vpx,stewnorriss/libvpx,mbebenita/aom,shacklettbp/aom,running770/libvpx,ShiftMediaProject/libvpx,mwgoldsmith/vpx,zofuthan/libvpx,VTCSecureLLC/libvpx,mwgoldsmith/libvpx,shyamalschandra/libvpx,thdav/aom,liqianggao/libvpx,webmproject/libvpx,luctrudeau/aom,mbebenita/aom,shyamalschandra/libvpx,felipebetancur/libvpx,VTCSecureLLC/libvpx,mwgoldsmith/libvpx,ittiamvpx/libvpx-1,smarter/aom,mwgoldsmith/vpx,liqianggao/libvpx,goodleixiao/vpx,zofuthan/libvpx,running770/libvpx,mwgoldsmith/libvpx,smarter/aom,ittiamvpx/libvpx-1,liqianggao/libvpx,GrokImageCompression/aom,ittiamvpx/libvpx-1,stewnorriss/libvpx,mbebenita/aom,running770/libvpx,shyamalschandra/libvpx,goodleixiao/vpx,webmproject/libvpx,shacklettbp/aom,ittiamvpx/libvpx-1,jmvalin/aom,running770/libvpx,thdav/aom,VTCSecureLLC/libvpx,stewnorriss/libvpx