staging: lustre: unwrap some ldebugfs_register() calls

When the third option (list) to ldebugfs_register() is NULL, it's the
same as just calling debugfs_create_dir().  So unwind this and call
debugfs_create_dir() directly.

This ends up saving lots of code as we do not need to do any error
checking of the return value (because it does not matter).

The ldebugfs_register() call will be removed in a later patch when it is
fully removed, right now there are 2 outstanding users of it in the
tree.

Cc: Oleg Drokin <[email protected]>
Cc: Andreas Dilger <[email protected]>
Cc: James Simmons <[email protected]>
Cc: NeilBrown <[email protected]>
Cc: Aastha Gupta <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Quentin Bouget <[email protected]>
Cc: Patrick Farrell <[email protected]>
Cc: Aliaksei Karaliou <[email protected]>
Cc: "John L. Hammond" <[email protected]>
Cc: Mathias Rav <[email protected]>
Cc: Andriy Skulysh <[email protected]>
Cc: Ben Evans <[email protected]>
Cc: Bob Glosman <[email protected]>
Cc: [email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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