SIGSEGV when cancelling async calls

This bug was reported by Michal Hruby, his words below:
-------------------------

0.2.12 can die a horrible death when one cancels
find_events/get_events/search call, resulting in:

Program received signal SIGSEGV, Segmentation fault.
0x00007ffff4d4c53f in zeitgeist_log_find_events_finish (self=0xc88dc0,
   res=0xde9460, error=0x713958) at zeitgeist-log.c:655
655 return _zeitgeist_simple_result_set_new (events, events->len);
(gdb) bt
#0 0x00007ffff4d4c53f in zeitgeist_log_find_events_finish (self=0xc88dc0,
   res=0xde9460, error=0x713958) at zeitgeist-log.c:655
#1 0x0000000000476027 in synapse_zeitgeist_plugin_real_search_co (
   data=0x7137d0) at zeitgeist-plugin.c:1481
#2 0x00007ffff4d4b628 in dispatch_async_callback (source_object=0xaa7050,
   res=0xde9460, user_data=0xe91d20) at zeitgeist-log.c:262
#3 0x00007ffff4d5ceef in generic_async_callback (source_object=0xc84440,
   res=0xde9760, user_data=0xde9460) at eggzeitgeistlog.c:522
#4 0x00007ffff4b131d9 in ?? () from /usr/lib/libeggdbus-1.so.0
#5 0x00007ffff4b135a5 in egg_dbus_connection_pending_call_cancel ()
  from /usr/lib/libeggdbus-1.so.0
#6 0x00007ffff4b1367d in ?? () from /usr/lib/libeggdbus-1.so.0
#7 0x00007ffff44045de in g_closure_invoke ()
  from /usr/lib/libgobject-2.0.so.0
#8 0x00007ffff4418598 in ?? () from /usr/lib/libgobject-2.0.so.0
#9 0x00007ffff4419a76 in g_signal_emit_valist ()
  from /usr/lib/libgobject-2.0.so.0
#10 0x00007ffff441a033 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#11 0x00007ffff486478e in g_cancellable_cancel ()
  from /usr/lib/libgio-2.0.so.0
---Type <return> to continue, or q <return> to quit---
#12 0x00000000004336b3 in _lambda7_ (instance=<value optimized out>,
   self=<value optimized out>) at data-sink.c:1310
#13 __lambda7__gcallback (instance=<value optimized out>,
   self=<value optimized out>) at data-sink.c:1319
#14 0x00007ffff44045de in g_closure_invoke ()
  from /usr/lib/libgobject-2.0.so.0
#15 0x00007ffff4418598 in ?? () from /usr/lib/libgobject-2.0.so.0
#16 0x00007ffff4419a76 in g_signal_emit_valist ()
  from /usr/lib/libgobject-2.0.so.0
#17 0x00007ffff441a033 in g_signal_emit () from /usr/lib/libgobject-2.0.so.0
#18 0x00007ffff486478e in g_cancellable_cancel ()
  from /usr/lib/libgio-2.0.so.0

I fixed the issue in
https://code.launchpad.net/~mhr3/libzeitgeist/eggdbus-stable-patch, and
it'd be nice to have one more bug fix release of the 0.2 branch - and
it'd also have the new vapi, yay! :)