[Bug 739281] video-blend: correct improper logic calculations

[GStreamer (bugzilla.gnome.org)]

https://bugzilla.gnome.org/show_bug.cgi?id=739281
  GStreamer | gst-plugins-base | unspecified

--- Comment #8 from Luis de Bethencourt <luis.bg at samsung.com> 2014-10-28 11:58:17 UTC ---
So you are proposing to have every user to check they aren't passing a bad
value instead of centralizing it and having video-blend catch it. Even though
the problem negative value creates is a segfault in video-blend.

I'm not sure I agree with you. Will think about it a bit more.

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