Merge branch 'pk/subsub-fetch-fix'

An earlier attempt to fix "git fetch --recurse-submodules" broke
another use case; revert it until a better fix is found.

* pk/subsub-fetch-fix:
  Revert "submodules: fix of regression on fetching of non-init subsub-repo"

diff --cc t/t5526-fetch-submodules.sh
Simple merge