g_utf8_validate: @str shouldn't end up annotated as utf8
g_utf8_validate: @str shouldn't end up annotated as utf8

In order for this function to have any point, it has to be possible to
pass non-UTF-8 data to it, so annotate @str as being array-of-guint8
instead of utf8.

https://bugzilla.gnome.org/show_bug.cgi?id=672548

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