Follow-up r33576: Simple optimization.
Follow-up r33576: Simple optimization.

Suggested by: gstein

* subversion/libsvn_ra_serf/xml.c
  (svn_ra_serf__add_open_tag_buckets): Use SERF_BUCKET_SIMPLE_STRING_LEN 
   macro for fixed length strings.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@873652 13f79535-47bb-0310-9956-ffa450edef68

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