gst/gstpad.c: Use g_value_get_object() instead of g_value_dup_gst_object(), to avoid...

gst/gstpad.c: Use g_value_get_object() instead of g_value_dup_gst_object(), to avoid double-reffing the pad template ...

Original commit message from CVS:
* gst/gstpad.c: (gst_pad_set_property):
Use g_value_get_object() instead of g_value_dup_gst_object(),
to avoid double-reffing the pad template (which we then sink,
so this worked previously if (and only if) the pad template
was floating.

* gst/gstpadtemplate.c: (gst_pad_template_init),
(gst_pad_template_pad_created):
Never return floating references to pad templates, create
them as initially-sunken.

Document an extra function (and make this stop sinking our
pad template, since that is now guaranteed to do nothing,
since we created it sunken).

* gst/gstghostpad.c:
Fix docs typo.