Changed the FOR_NB_SCREENS macro to always be a for loop that declares its own loop variable. This removes the need to declare this variable in the outer scope.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@30756 a1c6a512-1295-4272-9138-f99709370657

apps/root_menu.c

@@ -194,7 +194,6 @@ static int browser(void* param)
                         static const struct text_message message={lines, 2};
                         if(gui_syncyesno_run(&message, NULL, NULL) == YESNO_NO)
                             break;
-                        int i;
                         FOR_NB_SCREENS(i)
                             screens[i].clear_display();