[Bug 790431] gstpad: Make calls to GstPadActivateFunction MT-safe

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=790431

--- Comment #1 from Edward Hervey <bilboed at bilboed.com> ---
Created attachment 363788
  --> https://bugzilla.gnome.org/attachment.cgi?id=363788&action=edit
gstpad: Make calls to GstPadActivateFunction MT-safe

checking whether we already were in the target GstPadMode was being
done too early and there was the risk that we *would* end up
(de)activating a pad more than once.

Instead, re-do the check for pad mode when entering the final pad
(de)activation block.

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