tree 6290d7764e021537b8c7322cba828e183bdd6204
parent ddf362a2a9b6cf784497162d21556a950f99dce8
author Nguyễn Thái Ngọc Duy <pclouds@gmail.com> 1462700867 +0700
committer Junio C Hamano <gitster@pobox.com> 1462822148 -0700

grep.c: use error_errno()

While at there, improve the error message a bit (what operation failed?)

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>