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mmc: dwmmc: Fix off by one error

Description

mmc: dwmmc: Fix off by one error

The IVAR_MAX_DATA is supposed to have the number of descriptor X the mmc
block size and desc_count contain all this information + 1.

Reported by: phk
MFC after: 1 week

Details

Provenance
manuAuthored on
Parents
rS358449: Define SCTL_MASK32 when COMPAT_FREEBSD32 is defined.
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