Fix a typo in a test.
Fix a typo in a test.

* subversion/tests/libsvn_fs/fs-test.c
  (node_origin_rev): There's a difference between a struct containing
   a string and -1, and a struct containing the byte before a string
   and a default value.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@867966 13f79535-47bb-0310-9956-ffa450edef68

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