Follow-up to r37894.
Follow-up to r37894.

* subversion/libsvn_subr/io.c
  (svn_io_open_uniquely_named): Allocate the baton passed to
  apr_pool_cleanup_register in the result pool.

jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion,jmckaskill/subversion