block-sha1: put expanded macro parameters in parentheses
't' is currently always a numeric constant, but it can't hurt to prepare for the day that it becomes useful for a caller to pass in a more complex expression. Suggested-by: NLinus Torvalds <torvalds@linux-foundation.org> Signed-off-by: NJonathan Nieder <jrnieder@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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