[Bug 752154] metainfo: handle return value properly

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752154

--- Comment #1 from Vineeth <vineeth.tm at samsung.com> ---
Created attachment 307128
  --> https://bugzilla.gnome.org/attachment.cgi?id=307128&action=edit
handle return value of transform_func

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