[Bug 701323] New: input-selector: crash when requesting "active" property of pad with no selector

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=701323
  GStreamer | gstreamer (core) | git

           Summary: input-selector: crash when requesting "active"
                    property of pad with no selector
    Classification: Platform
           Product: GStreamer
           Version: git
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: Normal
         Component: gstreamer (core)
        AssignedTo: gstreamer-bugs at lists.freedesktop.org
        ReportedBy: self at brendanlong.com
         QAContact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---


Created an attachment (id=245696)
 View: https://bugzilla.gnome.org/attachment.cgi?id=245696
 Review: https://bugzilla.gnome.org/review?bug=701323&attachment=245696

Return FALSE for "active" property on input-selector pad if the input selector
is deleted

It's possible to have a reference to an input-selectors pads after it is
deleted. If you do a `g_object_get(pad, "active", &active; NULL)`, it will
segfault because the input selector (`sel`) is NULL.

This patch returns FALSE if there's no selector.

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