[Bug 791463] xvimagesink: fix inaccurate error message

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=791463

--- Comment #3 from Jun Xie <jun.xie at samsung.com> ---
Thanks, slomo.
I will provide more detailed info in future commit message.
This merged one is a good example to follow:)

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