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pfg
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2019-02-20T14:12:25.316379Z
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MFC r344042:
UMA: unsign some variables related to allocation in hash_alloc().

As a followup to r343673, unsign some variables related to allocation
since the hashsize cannot be negative. This gives a bit more space to
handle bigger allocations and avoid some implicit casting.

While here also unsign uh_hashmask, it makes little sense to keep it
signed.

Differential Revision:	https://reviews.freebsd.org/D19148

END