Re: [PATCH] submodule add: show 'add --dry-run' stderr when aborting

I think this got mis-merged when merging down `km/submodule-add-errmsg`:
it needs to be prefixed with `hint:` because of `hw/advice-add-nothing`,
i.e.

-- snipsnap --

diff --git a/t/t7400-submodule-basic.sh b/t/t7400-submodule-basic.sh
index 42a00f95b9d..a6973a3003c 100755
--- a/t/t7400-submodule-basic.sh
+++ b/t/t7400-submodule-basic.sh

@@ -158,7 +158,7 @@ test_expect_success 'submodule add to .gitignored path fails' '
 		cat <<-\EOF >expect &&
 		The following paths are ignored by one of your .gitignore files:
 		submod
-		Use -f if you really want to add them.
+		hint: Use -f if you really want to add them.
 		EOF
 		# Does not use test_commit due to the ignore
 		echo "*" > .gitignore &&