[PATCH] Fix possible crashers

[Bastien Nocera]

Heya,

Peter asked me to look at a few geoclue crashers[1] in the Red Hat
bugzilla, and with some hints from Colin and help from Matthias who
could reproduce the bug, I came up with the attached.

It seems correct to me, as I do something similar in fprintd.

I hope Matthias will be able to smoke-test it in his test environment
(home) before we merge it.

Opinions?

Cheers

[1]: https://bugzilla.redhat.com/show_bug.cgi?id=556257
and https://bugzilla.redhat.com/show_bug.cgi?id=528897
being prime examples
PS: Sorry about the dupe mail for some, addressbook completion problems
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