Fix a test failure in t/GstValue.t
Fix a test failure in t/GstValue.t

https://bugzilla.gnome.org/show_bug.cgi?id=649615
https://rt.cpan.org/Public/Bug/Display.html?id=66736

GNOME/perl-GStreamer,GNOME/perl-GStreamer,cpanxaoc/perl-GStreamer,cpanxaoc/perl-GStreamer