staging: lustre: remove last two users of ldebugfs_register()

ldebugfs_register() is just a call to debugfs_create_dir() and
ldebugfs_add_vars() if the list option is set.  Fix up the last two
users of this function to just call these two functions instead, and
delete the now unused ldebugfs_register() call.

This ends up cleaning up more code and making things smaller, always a
good thing.

Cc: Oleg Drokin <[email protected]>
Cc: Andreas Dilger <[email protected]>
Cc: James Simmons <[email protected]>
Cc: NeilBrown <[email protected]>
Cc: Ben Evans <[email protected]>
Cc: Quentin Bouget <[email protected]>
Cc: Arvind Yadav <[email protected]>
Cc: Arushi Singhal <[email protected]>
Cc: Julia Lawall <[email protected]>
Cc: Mathias Rav <[email protected]>
Cc: Dafna Hirschfeld <[email protected]>
Cc: "Gustavo A. R. Silva" <[email protected]>
Cc: Patrick Farrell <[email protected]>
Cc: Nadav Amit <[email protected]>
Cc: [email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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