[Bug 746011] gstpad : refactor gst_pad_link_prepare function

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=746011

--- Comment #5 from Changbok <changbok.chea at gmail.com> ---
Thank you for your opinion.

gst_pad_link_prepare() return OK means we can use srcpad,sinkpad(to link them).
So maybe GST_OBJECT_UNLOCK is not called at gst_pad_link_prepare() in OK case.

But if we use gst_pad_link_prepare() just for checking(for example,
gst_pad_can_link() API), we should unnecessarily add code to unlock pad for OK
case. Also unnecessarily need comments for description.

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