devpts: simplify two-level sysctl registration for pty_kern_table

There is no need to declare two tables to just create directories,
this can be easily be done with a prefix path with register_sysctl().

Simplify this registration.
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Signed-off-by: Christian Brauner (Microsoft) <brauner@kernel.org>

fs/devpts/inode.c

@@ -72,24 +72,6 @@ static struct ctl_table pty_table[] = {
 	{}
 };
 
-static struct ctl_table pty_kern_table[] = {
-	{
-		.procname	= "pty",
-		.mode		= 0555,
-		.child		= pty_table,
-	},
-	{}
-};
-
-static struct ctl_table pty_root_table[] = {
-	{
-		.procname	= "kernel",
-		.mode		= 0555,
-		.child		= pty_kern_table,
-	},
-	{}
-};
-
 struct pts_mount_opts {
 	int setuid;
 	int setgid;
@@ -630,7 +612,7 @@ static int __init init_devpts_fs(void)
 {
 	int err = register_filesystem(&devpts_fs_type);
 	if (!err) {
-		register_sysctl_table(pty_root_table);
+		register_sysctl("kernel/pty", pty_table);
 	}
 	return err;
 }