[Bug 752758] validate: descriptor-writer: Print proper error message when discover fails

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=752758

--- Comment #1 from Vineeth <vineeth.tm at samsung.com> ---
Created attachment 307963
  --> https://bugzilla.gnome.org/attachment.cgi?id=307963&action=edit
print proper error message when discovering fails

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