[Bug 789319] Fix up GIR annotations

[GStreamer (GNOME Bugzilla)]

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

--- Comment #5 from Arun Raghavan <arun at arunraghavan.net> ---
Created attachment 362050
  --> https://bugzilla.gnome.org/attachment.cgi?id=362050&action=edit
gst: Fix up a bunch of GIR annotations

This is mostly on nullable return values, and some other minor ones that
I ran across.

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