Use ULONG_MAX rather than implicit cast of -1.
At least one (older) version of the Solaris C compiler won't allow 'unsigned long x = -1' without explicitly casting -1 to a type of unsigned long. So instead use ULONG_MAX, which is really the correct constant anyway. Signed-off-by: NShawn O. Pearce <spearce@spearce.org> Signed-off-by: NJunio C Hamano <junkio@cox.net>
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