sysfs: disambiguate between "error code" and "failure" in comments
sysfs: disambiguate between "error code" and "failure" in comments

The sentence "Returns 0 on success or error" might be misinterpreted as
"the function will always returns 0", make it less ambiguous.

Also, use the word "failure" as the contrary of "success".

Signed-off-by: Antonio Ospite <632ac79459771f038f66f081af32ed9511cf9f1a@ao2.it>
Cc: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>
Cc: Jonathan Corbet <b2ce64d5587c02f12e367eac59751145a0660c51@lwn.net>
Cc: 720929ea79be81617af4e0222565cf72ea2ee041@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs