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Substitute driver-defined P2ALIGN() with EFX_P2ALIGN() defined in libefx. Cast value and alignment to one specified type to guarantee result correctness. Reported by: Andrea Valsania <andrea.valsania at answervad.it> Reviewed by: philip Sponsored by: Solarflare Communications, Inc. MFC after: 2 days Differential Revision: https://reviews.freebsd.org/D21075