Merge branch 'jc/maint-t7406-rev-parse-max-count-huh'

Test clean-up, with no behaviour change.

* jc/maint-t7406-rev-parse-max-count-huh:
  t7406: fix misleading "rev-parse --max-count=1 HEAD"

diff --cc t/t7406-submodule-update.sh
Simple merge