sh: Fix store queue bitmap end.
The end of the store queue bitmap is miscalculated when searching for a free range in sq_remap(), missing the PAGE_SHIFT shift that's done in sq_api_init(). This runs in to workloads where we can scan beyond the end of the bitmap. Spotted by Paul Jackson: http://marc.theaimsgroup.com/?l=linux-kernel&m=116493191224097&wSigned-off-by: NPaul Mundt <lethal@linux-sh.org>
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