Don't throw an error if multiple processes try to update the same entry in the BDB node origin cache simultaneously (as long as they are setting the same value!).
Don't throw an error if multiple processes try to update the same
entry in the BDB node origin cache simultaneously (as long as they are
setting the same value!).

* subversion/libsvn_fs_base/bdb/node-origins-table.c
  (svn_fs_bdb__set_node_origin): If the entry is already there, don't
    error unless it's actually a different value.

Patch by: cmpilato
Review by: me

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