[PATCH] make gconfig warning removal

From: "Maciej Soltysiak" <solt@dns.toxicfilms.tv>

make gconfig causes this:

scripts/kconfig/gconf.c: In function `on_treeview1_button_press_event':
scripts/kconfig/gconf.c:1175: warning: passing arg 1 of
`gtk_widget_grab_focus' from incompatible pointer type

scripts/kconfig/gconf.c

@@ -1172,7 +1172,7 @@ on_treeview1_button_press_event(GtkWidget * widget,
 
 	gtk_widget_realize(tree2_w);
 	gtk_tree_view_set_cursor(view, path, NULL, FALSE);
-	gtk_widget_grab_focus(GTK_TREE_VIEW(tree2_w));
+	gtk_widget_grab_focus(GTK_WIDGET(tree2_w));
 
 	return FALSE;
 }