[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 #41 from Vineeth <vineeth.tm at samsung.com> 2014-11-06 14:18:01 UTC ---
Thanks for the detailed reviews Tim :)

I won't hv access to system till Monday 
I will incorporate all the changes and submit the patch on Monday..

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