[PATCH] integrity: silence warning when CONFIG_SECURITYFS is not enabled

[Matthew Garrett]

On Mon, Jun 4, 2018 at 7:05 AM Sudeep Holla <sudeep.holla at arm.com> wrote:
> When CONFIG_SECURITYFS is not enabled, securityfs_create_dir returns
> -ENODEV which throws the following error:
>         "Unable to create integrity sysfs dir: -19"
>
> However, if the feature is disabled, it can't be warning and hence
> we need to silence the error.

I think it'd be preferable to check whether it's ENODEV rather than
doing IS_ENABLED. We should also reset integrity_dir to NULL rather
than leaving it as an error - it gets passed into various other
functions, and while those should all also just be returning errors
it'd be unfortunate if one attempted to dereference it.
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