[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

Tim-Philipp Müller <t.i.m> changed:

           What    |Removed                     |Added
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             Blocks|                            |739689

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