Remove a nearly-unused pool field from FSFS's dag_node_t.
Remove a nearly-unused pool field from FSFS's dag_node_t.

* subversion/libsvn_fs_fs/dag.c
  (dag_node_t): Remove pool field.
  (get_node_revision): Change doc to state that allocation
   is in the passed-in pool, not the node's pool (which was true
   before anyway).
  (svn_fs_fs__dag_get_node): Don't stow away a pool.
  (svn_fs_fs__dag_set_proplist): Use the passed-in pool instead of the
   node's pool to allocate an error string.
  (svn_fs_fs__dag_dup): Don't copy the pool pointer.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@867108 13f79535-47bb-0310-9956-ffa450edef68

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