apply, ls-files: simplify "-z" parsing
As a short option, we cannot handle negation. Thus a callback handling "unset" is overkill, and we can just use OPT_SET_INT instead to handle setting the option. Anybody who adds "--nul" synonym to this later would need to be careful not to break "--no-nul", which should mean that lines are terminated with LF at the end. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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