unpack-trees: don't perform any index operation if we're not merging
src[0] points to the index entry in the merge case and to the first tree to unpack in the non-merge case. We only want to mark the index entry, so check first if we're merging. Signed-off-by: NRene Scharfe <rene.scharfe@lsrfire.ath.cx> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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