Patch: fix crash in libhal_ctx_shutdown

[Frederic Crozat]

Hi,

the following patch fixes a crash in libhal, found when
libhal_ctx_shutdown is called while system bus was shutdown.

It ensures the way dbus error has handled in libhal_ctx_shutdown is the
same as the other functions in libhal.c (and it no longer crashes as a
bonus ;)
-- 
Frederic Crozat <fcrozat at mandriva.com>
Mandriva
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