Fix warning message in the ParamSpec validation

When validating a new GValue against the ClutterParamSpecUnits, we issue
a warning when the units do not match with both the new value and the
unit we expect to have. Unfortunately we were printing the unit of the
new value twice and not the unit of the ParamSpec.

http://bugzilla.openedhand.com/show_bug.cgi?id=1846

clutter/clutter-units.c

@@ -816,7 +816,7 @@ param_units_validate (GParamSpec *pspec,
       g_warning ("The units value of '%s' does not have the same unit "
                  "type as declared by the ClutterParamSpecUnits of '%s'",
                  str,
-                 clutter_unit_type_name (otype));
+                 clutter_unit_type_name (uspec->default_type));
 
       g_free (str);