read_loose_refs(): simplify function logic
Make it clearer that there are two possible ways to read the reference, but that we handle read errors uniformly regardless of which way it was read. This refactoring also makes the following change easier to implement. Signed-off-by: NMichael Haggerty <mhagger@alum.mit.edu> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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