match_explicit_lhs: allow a "verify only" mode
The match_explicit_lhs function has all of the logic necessary to verify the refspecs without actually doing any work. This patch lets callers pass a NULL "match" pointer to indicate they want a "verify only" operation. For the most part, we just need to avoid writing to the NULL pointer. However, we also have to refactor the try_explicit_object_name sub-function; it indicates success by allocating and returning a new ref. Instead, we give it an "out" parameter for the match and return a numeric status. Signed-off-by: NJeff King <peff@peff.net> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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