[Bug 767635] gleffects: fix little rectangel appears at the center when use squeeze and tunnel effects

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=767635

--- Comment #7 from Matthew Waters (ystreet00) <ystreet00 at gmail.com> ---
commit 5e8a650130d932a10b9dd8ae4f2cf7b4b714e472
Author: Haihua Hu <jared.hu at nxp.com>
Date:   Tue Jun 14 13:48:09 2016 +0800

    gleffects: fix little rectangle that appears at the center of squeeze and
tunnel effects

    These two shader will calculate the vector length and use it as
denominator.
    But length could be zero which will cause undefine behaviour. Add
protection for
    this condition

    https://bugzilla.gnome.org/show_bug.cgi?id=767635

and 1.8 0e395b5c620c0ca6e7189328de3d848f42dc443b

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