[patch] Fix for big memleak

[Joe Shaw]

Hi,

Attached is a patch which fixes a pretty serious memory leak in d-bus.

When a DBusPendingCall is created in dbus_connection_send_with_reply(),
it has a refcount of 1.  The refcount is incremented in
_dbus_connection_attach_pending_call_unlocked(), and handles unreffing
it later.  The initial ref from the creation is never released, however,
and so both the pending call and the attached DBusMessage reply are
leaked.  This patch unrefs the pending after attaching it to the
connection, effectively passing the ownership on.

I'm also attaching a test program which illustrates the problem.
Without the patch the program grows to about 30 megs.  With the patch,
only about 4.

Thanks,
Joe
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