[patch] libhal - allow NULLs for DBusError parameters

[John (J5) Palmieri]

Most libhal methods now require an additional DBusError pointer to be
passed into the method.  Sometimes errors are expected in a world where
device can be added or removed at any moment.  These errors can be
handled based on the return value of the method and do not need the
extra verbosity that the dbus errors provide.  Attached is a patch which
allows a NULL value to be passed to all methods which read HAL keys
indicating that a dbus error is not needed thereby freeing the
programmer from having to initialize and free dbus error objects when
they are not needed.

-- 
John (J5) Palmieri
Associate Software Engineer
Desktop Group
Red Hat, Inc.
Blog: http://martianrock.com
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