USB: core: no need to check return value of debugfs_create functions

When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

Cc: Johan Hovold <johan@kernel.org>
Cc: Kai-Heng Feng <kai.heng.feng@canonical.com>
Cc: Peter Chen <peter.chen@nxp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/usb/core/usb.c

@@ -1167,30 +1167,16 @@ static struct notifier_block usb_bus_nb = {
 struct dentry *usb_debug_root;
 EXPORT_SYMBOL_GPL(usb_debug_root);
 
-static struct dentry *usb_debug_devices;
-
-static int usb_debugfs_init(void)
+static void usb_debugfs_init(void)
 {
 	usb_debug_root = debugfs_create_dir("usb", NULL);
-	if (!usb_debug_root)
-		return -ENOENT;
-
-	usb_debug_devices = debugfs_create_file("devices", 0444,
-						usb_debug_root, NULL,
+	debugfs_create_file("devices", 0444, usb_debug_root, NULL,
 			    &usbfs_devices_fops);
-	if (!usb_debug_devices) {
-		debugfs_remove(usb_debug_root);
-		usb_debug_root = NULL;
-		return -ENOENT;
-	}
-
-	return 0;
 }
 
 static void usb_debugfs_cleanup(void)
 {
-	debugfs_remove(usb_debug_devices);
-	debugfs_remove(usb_debug_root);
+	debugfs_remove_recursive(usb_debug_root);
 }
 
 /*
@@ -1205,9 +1191,7 @@ static int __init usb_init(void)
 	}
 	usb_init_pool_max();
 
-	retval = usb_debugfs_init();
-	if (retval)
-		goto out;
+	usb_debugfs_init();
 
 	usb_acpi_register();
 	retval = bus_register(&usb_bus_type);