verify_lock(): report errors via a strbuf
Instead of writing error messages directly to stderr, write them to a "strbuf *err". The caller, lock_ref_sha1_basic(), uses this error reporting convention with all the other callees, and reports its error this way to its callers. Signed-off-by: NMichael Haggerty <mhagger@alum.mit.edu> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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