More membuffer cache fixes.
More membuffer cache fixes.

* subversion/libsvn_subr/cache-membuffer.c
  (initialize_group): Fix-up group index calculation.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1125169 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion