vfs: for usbfs, etc. internal vfsmounts ->mnt_sb->s_root == ->mnt_root

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/drivers/usb/core/inode.c b/drivers/usb/core/inode.c
index 2278dad..0a4613d 100644
--- a/drivers/usb/core/inode.c
+++ b/drivers/usb/core/inode.c
@@ -501,7 +501,7 @@
 	 */
 	if (!parent ) {
 		if (usbfs_mount && usbfs_mount->mnt_sb) {
-			parent = usbfs_mount->mnt_sb->s_root;
+			parent = usbfs_mount->mnt_root;
 		}
 	}
 
@@ -608,7 +608,7 @@
 
 	ignore_mount = 0;
 
-	parent = usbfs_mount->mnt_sb->s_root;
+	parent = usbfs_mount->mnt_root;
 	devices_usbfs_dentry = fs_create_file ("devices",
 					       listmode | S_IFREG, parent,
 					       NULL, &usbfs_devices_fops,
@@ -662,7 +662,7 @@
 
 	sprintf (name, "%03d", bus->busnum);
 
-	parent = usbfs_mount->mnt_sb->s_root;
+	parent = usbfs_mount->mnt_root;
 	bus->usbfs_dentry = fs_create_file (name, busmode | S_IFDIR, parent,
 					    bus, NULL, busuid, busgid);
 	if (bus->usbfs_dentry == NULL) {