builtin/merge-file.c: use error_errno()
All these error() calls do not print error message previously, but because when they are called, errno should be set. Use error_errno() instead to give more information. Signed-off-by: NNguyễn Thái Ngọc Duy <pclouds@gmail.com> Signed-off-by: NJunio C Hamano <gitster@pobox.com>
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