[Bug 772497] waveform : Fix Memory leak by gst_caps_to_string

[GStreamer (GNOME Bugzilla)]

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

--- Comment #5 from Gaurav <g.gupta at samsung.com> ---
Shaill I change other instances also where gst_caps_to_string() is used for
logging/error reporting?

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