[Bug 789319] Fix up GIR annotations

[GStreamer (GNOME Bugzilla)]

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

--- Comment #2 from Arun Raghavan <arun at arunraghavan.net> ---
Created attachment 362047
  --> https://bugzilla.gnome.org/attachment.cgi?id=362047&action=edit
devicemonitor: Don't return NULL when listing providers

This should make client code simpler, as it doesn't have to do an extra
NULL check when the number of providers is 0.

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