message: support: do not check DCO on merge commits
diff: @@ -35,8 +35,8 @@ do
  #
  # In general, we can't assume that the commits are signed off by author
  # pushing, so we settle for just checking that there is a signoff at all.
  - SIGNED_OFF=$(git rev-list --grep "^Signed-off-by: " "$RANGE")
  - NOT_SIGNED_OFF=$(git rev-list "$RANGE" | grep -Fxv "$SIGNED_OFF")
  + SIGNED_OFF=$(git rev-list --no-merges --grep "^Signed-off-by: " "$RANGE")
  + NOT_SIGNED_OFF=$(git rev-list --no-merges "$RANGE" | grep -Fxv "$SIGNED_OFF")
  if [ -n "$NOT_SIGNED_OFF" ]
  then
  echo >&2 "ERROR: The following commits do not have DCO signoff:"
  