Style tweak.

* subversion/libsvn_fs_fs/fs_fs.c
  (get_revision_proplist): Ren ame a local variable to use the conventional
    name for variables of that type, rather than the name of one of the members
    of the struct it points to.

git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1515331 13f79535-47bb-0310-9956-ffa450edef68