[Bug 789319] Fix up GIR annotations

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789319

--- Comment #3 from Arun Raghavan <arun at arunraghavan.net> ---
Created attachment 362048
  --> https://bugzilla.gnome.org/attachment.cgi?id=362048&action=edit
deviceprovider: Don't return a NULL list of hidden providers

Should make things simpler from a client API perspective, avoiding the
need to check the return value for the zero-length case.

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