rev-list: allow -<n> as shorthand for --max-count=<n>
This builds on top of the previous one. Traditionally, head(1) and tail(1) allow their line limits to be parsed this way. Signed-off-by: NEric Wong <normalperson@yhbt.net> Signed-off-by: NJunio C Hamano <junkio@cox.net>
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