get_sha1_basic(): fix invalid memory access, found by valgrind
When get_sha1_basic() is passed a buffer of len 0, it should not check if buf[len-1] is a curly bracket. Signed-off-by: NJohannes Schindelin <johannes.schindelin@gmx.de> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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