Use an iteration subpool when copying revprops during svnsync init.
Use an iteration subpool when copying revprops during svnsync init.

* subversion/svnsync/main.c
  (do_initialize): Use an iteration subpool.

Suggested by: lundblad

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