staging: lustre: remove ldebugfs_add_simple() wrapper

It was only being called in one place, and is an unneeded wrapper
function around debugfs_create_file() so just call the real debugfs
function instead.  This ends up cleaning up some unneeded error handling
logic that was never needed as well.

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

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