[Bug 755854] validate:launcher: Add proper check for is_seekable

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=755854

--- Comment #1 from Vineeth <vineeth.tm at samsung.com> ---
Created attachment 312399
  --> https://bugzilla.gnome.org/attachment.cgi?id=312399&action=edit
fix return value of is_seekable function

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