[Bug 764972] New: dvbsrc: needlessly perform delivery system autodetection twice

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=764972

            Bug ID: 764972
           Summary: dvbsrc: needlessly perform delivery system
                    autodetection twice
    Classification: Platform
           Product: GStreamer
           Version: git master
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-bad
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: reynaldo at opendot.cl
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

Created attachment 325827
  --> https://bugzilla.gnome.org/attachment.cgi?id=325827&action=edit
dvbsrc: do not autodetect delsys twice

By design we open the adapter twice, but performing delsys auto-detection twice
too is totally redundant and costly.

Attached patch makes auto-detection happen only 1 time but has the downside of
(IMHO correctly) posting the _new_element message with the discovered adapter
information once too. Might someone out there be relying on this odd behavior?
Would that be enough reason to keep doing this twice?

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