[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 #4 from Luis de Bethencourt <luis.bg at samsung.com> 2014-10-28 10:49:21 UTC ---
Textoverlay isn't the only user of video-blend.c, so this code isn't dead since
it is a check for other elements passing strange values as well.

Unless anybody thinks otherwise, I am going to reject this patch.

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