[Bug 765904] deviceproviderfactory: fix factory leak

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=765904

--- Comment #1 from Guillaume Desmottes <gdesmott at gnome.org> ---
Created attachment 327153
  --> https://bugzilla.gnome.org/attachment.cgi?id=327153&action=edit
deviceproviderfactory: fix factory leak

The code path when early returning was leaking the extra reference on
the factory.

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