Follow-up to r1400670.
Follow-up to r1400670.

* subversion/libsvn_subr/cache-membuffer.c
  (membuffer_cache_set_partial_internal): don't keep outdated data
   when the new data could not be put into the cache

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1400679 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion