VFS: Unexport do_kern_mount() and clean up simple_pin_fs()

Replace all module uses with the new vfs_kern_mount() interface, and fix up
simple_pin_fs().

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
diff --git a/drivers/usb/core/inode.c b/drivers/usb/core/inode.c
index 3cf945c..695b90a 100644
--- a/drivers/usb/core/inode.c
+++ b/drivers/usb/core/inode.c
@@ -569,7 +569,7 @@
 	ignore_mount = 1;
 
 	/* create the devices special file */
-	retval = simple_pin_fs("usbfs", &usbfs_mount, &usbfs_mount_count);
+	retval = simple_pin_fs(&usb_fs_type, &usbfs_mount, &usbfs_mount_count);
 	if (retval) {
 		err ("Unable to get usbfs mount");
 		goto exit;