t / t4013 / diff.diff-tree_--cc_--stat_masteron commit print errno when reporting a system call error (5118d7f)
   1$ git diff-tree --cc --stat master
   259d314ad6f356dd08601a4cd5e530381da3e3c64
   3 dir/sub | 2 ++
   4 file0   | 3 +++
   5 2 files changed, 5 insertions(+)
   6$