[Bug 752154] metainfo: handle return value properly

[GStreamer (GNOME Bugzilla)]

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

--- Comment #2 from Vineeth <vineeth.tm at samsung.com> ---
Created attachment 307130
  --> https://bugzilla.gnome.org/attachment.cgi?id=307130&action=edit
buffer: stop iterating when transform_func fails.

This is basically same as the patch in adapter.
When the transform_func fails, there is no need to continue with the loop
as it will fail again.

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