staging: lustre: remove ldebugfs_register_stats() wrapper function

It was just calling debugfs_create_file() so unwind things and just call
the real function instead.  This ends up saving a number of lines as
there was never any error handling happening anyway, so that all can be
removed as well.

Cc: Oleg Drokin <[email protected]>
Cc: Andreas Dilger <[email protected]>
Cc: James Simmons <[email protected]>
Cc: Ben Evans <[email protected]>
Cc: Quentin Bouget <[email protected]>
Cc: NeilBrown <[email protected]>
Cc: Arushi Singhal <[email protected]>
Cc: Arvind Yadav <[email protected]>
Cc: Patrick Farrell <[email protected]>
Cc: Aliaksei Karaliou <[email protected]>
Cc: Aastha Gupta <[email protected]>
Cc: Dafna Hirschfeld <[email protected]>
Cc: Mathias Rav <[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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