[Bug 750089] validate: media-check: add to print new line

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=750089

--- Comment #3 from Wonchul Lee <chul0812 at gmail.com> ---
No, It makes a report when it fails with using gat-validate-launcher.

I tried to analyse failure test case with gst-validate-media-check-1.0, and
command line became a little bit unclean state after print failure log due to
missing newline character. So, I just add a tiny patch of it.

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