[Bug 787885] pngenc: fix memory leak

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=787885

--- Comment #2 from Ponnam Srinivas <p.srinivas at samsung.com> ---
Created attachment 360099
  --> https://bugzilla.gnome.org/attachment.cgi?id=360099&action=edit
patch file attached

Modified code. Patch attached . Please review it

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