Avoid unnecessary database query for every node when retrieving all nodes in
a changelist.

* subversion/libsvn_wc/adm_ops.c
  (get_node_changelist): Don't read node twice to read just the same value.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1630584 13f79535-47bb-0310-9956-ffa450edef68