remove prefix argument from pathspec_prefix
Passing a prefix to a function that is supposed to find the prefix is strange. And it's really only used if the pathspec is NULL. Make the callers handle this case instead. As we are always returning a fresh copy of a string (or NULL), change the type of the returned value to non-const "char *". Signed-off-by: NClemens Buchacher <drizzd@aon.at> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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