[Dovecot] Expire plugin with Mysql

[Eric T]

> 
> Seems to work in my tests. Could you do a bit more with gdb:
> 
>> 	#6  0x0812e512 in client_dict_connect (dict=0x819abc8)
>> 	    at /var/tmp/dovecot-1.1.rc6/src/lib-dict/dict-client.c:268
>> 		query = 0x8178664 "D\206\027\b\003"
> 
> fr 6
> p *dict



Program terminated with signal 11, Segmentation fault.
#0  0xfed0578c in strlen () from /lib/libc.so.1
(gdb) fr 6
#6  0x0812e512 in client_dict_connect (dict=0x819abc8)
    at /var/tmp/dovecot-1.1.rc6/src/lib-dict/dict-client.c:268
268                                     dict->value_type, dict->username,
dict->uri);
Current language:  auto; currently minimal
(gdb) p *dict
$1 = {dict = {name = 0x8163b6c "proxy", v = {
      init = 0x812e640 <client_dict_init>,
      deinit = 0x812e770 <client_dict_deinit>,
      lookup = 0x812e7b0 <client_dict_lookup>,
      iterate_init = 0x812e8c0 <client_dict_iterate_init>,
      iterate = 0x812e9c0 <client_dict_iterate>,
      iterate_deinit = 0x812eb00 <client_dict_iterate_deinit>,
      transaction_init = 0x812eb70 <client_dict_transaction_init>,
      transaction_commit = 0x812ebd0 <client_dict_transaction_commit>,
      transaction_rollback = 0x812ed00 <client_dict_transaction_rollback>,
      set = 0x812ed90 <client_dict_set>,
      unset = 0x812ee20 <client_dict_unset>,
      atomic_inc = 0x812ee90 <client_dict_atomic_inc>}}, pool = 0x819abb0,
  fd = 13, uri = 0x819ac30 "expiredict", username = 0x0,
  path = 0x8163a8c "/opt/dovecot/var/run/dovecot/dict-server",
  value_type = DICT_DATA_TYPE_UINT32, last_connect_try = 1212365823,
  input = 0x81b3018, output = 0x81b8d9c, connect_counter = 0,
  transaction_id_counter = 0, in_iteration = 0, handshaked = 0}