Revert "Btrfs: fix scrub to repair raid6 corruption"

This reverts commit d91bb7c6.

This commit used an incorrect log message.

Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Reported-by: Ben Hutchings <ben.hutchings@codethink.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>