pidgin/pidgin

g_task_return_* refs a task so we need to make sure we remove our reference when we're done with the task.

Testing Done:
Compiled and connected to bonjour and xmpp locally.

Reviewed at https://reviews.imfreedom.org/r/470/
nullclient = executable('nullclient', 'nullclient.c', 'defines.h',
c_args : ['-DSTANDALONE'],
dependencies : [libpurple_dep, glib])