Revert "usb: gadget: hid: Convert to use list_count()"

This reverts commit 33f00f41 as it
breaks the build.

Link: https://lore.kernel.org/r/20221130131854.35b58b16@canb.auug.org.au
Link: https://lore.kernel.org/r/202211301628.iwMjPVMp-lkp@intel.com
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/gadget/legacy/hid.c

@@ -133,11 +133,14 @@ static struct usb_configuration config_driver = {
 static int hid_bind(struct usb_composite_dev *cdev)
 {
 	struct usb_gadget *gadget = cdev->gadget;
+	struct list_head *tmp;
 	struct hidg_func_node *n = NULL, *m, *iter_n;
 	struct f_hid_opts *hid_opts;
-	int status, funcs;
+	int status, funcs = 0;
+
+	list_for_each(tmp, &hidg_func_list)
+		funcs++;
 
-	funcs = list_count(&hidg_func_list);
 	if (!funcs)
 		return -ENODEV;