[Bug 791069] log failing OMX calls as errors

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791069

--- Comment #1 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 364743
  --> https://bugzilla.gnome.org/attachment.cgi?id=364743&action=edit
log failing OMX calls as errors

I find it confusing when debugging that OMX calls returning an error
where not logged as GST_LEVEL_ERROR making them harder to spot.
Fix this by introducing simple log macros checking the return value of
the OMX call and logging failures as errors.

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