[Bug 772497] waveform : Fix Memory leak by gst_caps_to_string

[GStreamer (GNOME Bugzilla)]

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

--- Comment #2 from Gaurav <g.gupta at samsung.com> ---
SO, you mean using GST_PTR_FORMAT is better way as it avoid memory allocation
also ?
So, is it the best way wherever gst_caps_to_string() is used for logging/error
reporting purposes?

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