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/plugins/metronome.c

@@ -781,7 +781,6 @@ static void metronome_draw(struct screen* display)
 
 static void draw_display(void)
 {
-    int i;
     FOR_NB_SCREENS(i)
         metronome_draw(rb->screens[i]);
 }