staging: lustre: no need to check debugfs return values

When calling debugfs functions, there is no need to ever check the
return value.  The function can work or not, but the code logic should
never do something different based on this.

Clean up the lustre core code by not caring about the value of debugfs
calls.  This ends up removing a number of lines of code that are not
needed.

Note, more work is needed to remove the unneeded debugfs wrapper
functions in the future.

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: Arvind Yadav <[email protected]>
Cc: "John L. Hammond" <[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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