t / t5100 / msg0010on commit refs: add "for_each_ref_in" function to refactor "for_each_*_ref" functions (2a8177b)
   1"Subject: " isn't in the static array "header", and thus
   2memcmp("Subject: ", header[i], 7) will never match.
   3
   4Signed-off-by: Lukas Sandström <lukass@etek.chalmers.se>
   5Signed-off-by: Junio C Hamano <gitster@pobox.com>