various GLib tests: plug memory leaks

These don't really matter, since it's test code, but they do obscure
real leaks in the library.

Signed-off-by: Simon McVittie <simon.mcvittie@collabora.co.uk>
Bug: https://bugzilla.gnome.org/show_bug.cgi?id=666115
Acked-by: Matthias Clasen <mclasen@redhat.com>

gobject/tests/param.c

@@ -25,6 +25,7 @@ test_param_value (void)
   g_param_spec_unref (p2);
 
   g_value_unset (&value);
+  g_param_spec_unref (pp);
 }
 
 static gint destroy_count;