[Bug 772497] waveform : Fix Memory leak by gst_caps_to_string

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=772497

--- Comment #3 from Sebastian Dröge (slomo) <slomo at coaxion.net> ---
It does not avoid the allocation, it just avoids additional code. It also only
works in the GST_DEBUG (etc) macros. Do
> GST_CAT_LOG_OBJECT (......, "bla %" GST_PTR_FORMAT, caps)

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