[Bug 739789] v4l2allocator: fix error message if allocator is already active

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739789
  GStreamer | gst-plugins-good | git

--- Comment #1 from Aurélien Zanelli <aurelien.zanelli at parrot.com> 2014-11-07 15:17:38 UTC ---
Created an attachment (id=290177)
 View: https://bugzilla.gnome.org/attachment.cgi?id=290177
 Review: https://bugzilla.gnome.org/review?bug=739789&attachment=290177

v4l2allocator: fix error message if allocator is already active

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