[Bug 785679] element: add gst_element_foreach_*pad()

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=785679

--- Comment #11 from Tim-Philipp Müller <t.i.m at zen.co.uk> ---
> +  GST_OBJECT_LOCK (element);
> +  n_pads = *p_npads;
> +  pads = g_newa (GstPad *, n_pads + 1);
> 
> why + 1 ?

Laziness, so we don't have to special-case/catch the n_pads=0 case inside the
lock: I don't know if we can expect g_newa() to always behave well for n=0 - do
you know if it's fine?

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