debug_menu: show 2nd SD/MMC card info only if NUM_DRIVES > 1

commit eafcbd3fd6a72a1a8b1f8854f8cec3b6ea4d0625
Author: Aidan MacDonald <[email protected]>
Date:   Mon Mar 2 10:38:29 2026 +0000

    debug_menu: show 2nd SD/MMC card info only if NUM_DRIVES > 1
    
    Toggling to the second card was allowed if HAVE_HOTSWAP
    was defined, but on targets with a single hotswappable
    SD card -- for example many JZ47xx/X1000 targets -- this
    ends up calling card_get_info() on a non-existent drive.
    
    A slightly better option is to check if NUM_DRIVES is
    greater than 1. This is still just guessing the number
    of SD/MMC slots, but it should be wrong in fewer cases.
    
    Change-Id: Ifca29323f1c7091d9cce55c73147d0d1decae9a5

diff --git a/apps/debug_menu.c b/apps/debug_menu.c
index 117194b834..71686efba2 100644
--- a/apps/debug_menu.c
+++ b/apps/debug_menu.c
@@ -1283,7 +1283,7 @@ static int disk_callback(int btn, struct gui_synclist *lists)
 
     if ((btn == ACTION_STD_OK) || (btn == SYS_FS_CHANGED) || (btn == ACTION_REDRAW))
     {
-#ifdef HAVE_HOTSWAP
+#if NUM_DRIVES > 1
         if (btn == ACTION_STD_OK)
         {
             *cardnum ^= 0x1; /* change cards */
-- 
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