Avoid a potential null-pointer dereference in an error path.
Avoid a potential null-pointer dereference in an error path.

* subversion/libsvn_wc/wc_db.c
  (svn_wc__db_read_pristine_info):  Only attempt to recreate an error if it
    exists, otherwise just use an existing error.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1132739 13f79535-47bb-0310-9956-ffa450edef68

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