Bug 770928: Critical warning clicking history color button

(gimp-2.9:3): Gimp-Core-CRITICAL **: gimp_marshal_VOID__OBJECT_POINTER: assertion 'n_param_values == 3' failed

Conflict between signal marshal function
and signal emission.

app/widgets/gimpcolorhistory.c

@@ -99,7 +99,7 @@ gimp_color_history_class_init (GimpColorHistoryClass *klass)
                   G_SIGNAL_RUN_FIRST,
                   G_STRUCT_OFFSET (GimpColorHistoryClass, color_selected),
                   NULL, NULL,
-                  gimp_marshal_VOID__OBJECT_POINTER,
+                  gimp_marshal_VOID__POINTER,
                   G_TYPE_NONE, 1,
                   G_TYPE_POINTER);