spi: cf_spi: Use to_cf_spi_slave to resolve cfslave from slave
Don't assume slave is always the first member of struct cf_spi_slave. Use container_of instead of casting first structure member. Signed-off-by: NAxel Lin <axel.lin@ingics.com> Reviewed-by: NJagannadha Sutradharudu Teki <jagannadh.teki@gmail.com>
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