[Bug 766172] v4l2videodec: [Regressions] Should not fail if S_FMT(CAPTURE) fail after STREAMON(CAPTURE)

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=766172

--- Comment #2 from Nicolas Dufresne (stormer) <nicolas at ndufresne.ca> ---
Created attachment 329332
  --> https://bugzilla.gnome.org/attachment.cgi?id=329332&action=edit
v4l2: Add an error return to _try/_set_format

This way one can easily ignore errors. Previously, error were always
posted ont he bus.

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