mmc: Fix crash in mmc_block on 64-bit
Fairly simple. "dev_use" was being allocated as a zero length array because of bad math on 64-bit systems, causing a crash in find_first_zero_bit(). One-liner follows: Signed-off-by: NBen Collins <ben.collins@canonical.com> Acked-by: NPierre Ossman <drzeus@drzeus.cx> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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