[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 #6 from Vineeth <vineeth.tm at samsung.com> 2014-10-28 10:58:19 UTC ---
***i meant the alternate fix as below

if(x < 0 !! x > dest_width)
 x = 0;
if(y < 0 !! y > dest_height)
 y = 0;

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