[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 #9 from Vineeth <vineeth.tm at samsung.com> 2014-10-28 12:00:35 UTC ---
actually i updated the patch with the alternate fix,
where video-blend checks for x/y < 0 and x/y > dest_width/height and resets it
to 0
which will be a common fix as suggested by you

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