Fix FS#9842 by stopping scrolling before leaving the yesno screen.

Seems there are more of this scrolling problems around. In this case it's a rather old bug actually.

git-svn-id: svn://svn.rockbox.org/rockbox/trunk@22633 a1c6a512-1295-4272-9138-f99709370657

apps/gui/yesno.c

@@ -185,5 +185,8 @@ enum yesno_res gui_syncyesno_run(const struct text_message * main_message,
     }
     if(result_displayed)
         sleep(HZ);
+
+    FOR_NB_SCREENS(i) /* stop scrolling before getting out */
+        screens[i].scroll_stop(yn[i].vp);
     return(result);
 }