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Since the core framework now wraps the functions, ensuring
drives only have to implement functions that do something,
drop the now no longer required callbacks for state and
write_complete.
Signed-off-by: Moritz Fischer <mdf@kernel.org>
Link: https://lore.kernel.org/r/20210726030806.714809-1-mdf@kernel.org

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>