[Bug 796790] camerabin: Fix elements_created state tracking

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=796790

--- Comment #1 from Nicolas Dufresne (ndufresne) <nicolas at ndufresne.ca> ---
Created attachment 372996
  --> https://bugzilla.gnome.org/attachment.cgi?id=372996&action=edit
camerabin: Fix elements_created state tracking

The boolean state was tied to the function success state, while in fact
it only applies to the elements being added to the pipeline. If the
function fails later for other reason, we end up trying to add elements
with the same name in the bin. This fixes error recovery in cheese.

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