staging: lustre: get rid of ldebugfs_remove()

It was just a dumb wrapper around debugfs_remove_recursive() so just
call the function properly.  Also, there is no need to set the dentry to
NULL, it's gone, who cares about it anymore...

Cc: Oleg Drokin <[email protected]>
Cc: Andreas Dilger <[email protected]>
Cc: James Simmons <[email protected]>
Cc: NeilBrown <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Roman Storozhenko <[email protected]>
Cc: Aastha Gupta <[email protected]>
Cc: Ben Evans <[email protected]>
Cc: Quentin Bouget <[email protected]>
Cc: Arvind Yadav <[email protected]>
Cc: Arushi Singhal <[email protected]>
Cc: Patrick Farrell <[email protected]>
Cc: Aliaksei Karaliou <[email protected]>
Cc: Mathias Rav <[email protected]>
Cc: Andriy Skulysh <[email protected]>
Cc: Dafna Hirschfeld <[email protected]>
Cc: "Gustavo A. R. Silva" <[email protected]>
Cc: Bob Glosman <[email protected]>
Cc: [email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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