Minor membuffer cache optimization.
Minor membuffer cache optimization.

* subversion/libsvn_subr/cache-membuffer.c
  (svn_membuffer_cache_get,
   svn_membuffer_cache_get_partial): no need to clear our scratch pool
   here because we don't use it in the getters

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1442054 13f79535-47bb-0310-9956-ffa450edef68

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