drivers/staging/speakup/: avoid world-writable sysfs files.
In line with practice for module parameters, we're adding a build-time check that sysfs files aren't world-writable. Cc: Christopher Brannon <chris@the-brannons.com> Cc: Samuel Thibault <samuel.thibault@ens-lyon.org> Acked-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: NRusty Russell <rusty@rustcorp.com.au>
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