usg: gadget: Move validation out of lock in webusb_bcdVersion_store()

Validation has nothing to do with any protected data,
move it out of the lock and make code neater.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20230127112638.84806-1-andriy.shevchenko@linux.intel.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/gadget/configfs.c

@@ -836,19 +836,15 @@ static ssize_t webusb_bcdVersion_store(struct config_item *item,
 	if (ret)
 		return ret;
 
-	mutex_lock(&gi->lock);
-
 	ret = is_valid_bcd(bcdVersion);
 	if (ret)
-		goto out;
+		return ret;
 
+	mutex_lock(&gi->lock);
 	gi->bcd_webusb_version = bcdVersion;
-	ret = len;
-
-out:
 	mutex_unlock(&gi->lock);
 
-	return ret;
+	return len;
 }
 
 static ssize_t webusb_bVendorCode_show(struct config_item *item, char *page)