[PATCH] t6300: avoid creating refs/heads/HEAD

In one test, we use "git checkout --orphan HEAD" to create
an unborn branch. Confusingly, the resulting branch is named
"refs/heads/HEAD". The original probably meant something
like:

  git checkout --orphan orphaned-branch HEAD

Let's just use "orphaned-branch" here to make this less
confusing. Putting HEAD in the second argument is already
implied.

Signed-off-by: Jeff King <redacted>
---
This comes originally from Junio's 84679d470. I cannot see how naming
the new branch HEAD would make any difference to the test, but perhaps I
am missing something.

I noticed this while digging on a nearby issue around "git branch -m @".
This does happen to be the only test that checks that we can make a
branch called refs/heads/HEAD, and I found it because it triggers if you
try to disallow "git branch -m HEAD". :)

If we care about that, though, I think we should make an explicit test
for "git branch HEAD". But I'm not sure we _do_ care about that. Making
a branch called HEAD is moderately insane, and I don't think it would be
unreasonable for us to outlaw it at some point.

 t/t6300-for-each-ref.sh | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/t/t6300-for-each-ref.sh b/t/t6300-for-each-ref.sh
index aea1dfc71..a468041c5 100755
--- a/t/t6300-for-each-ref.sh
+++ b/t/t6300-for-each-ref.sh

@@ -558,7 +558,7 @@ test_expect_success 'do not dereference NULL upon %(HEAD) on unborn branch' '
 	test_when_finished "git checkout master" &&
 	git for-each-ref --format="%(HEAD) %(refname:short)" refs/heads/ >actual &&
 	sed -e "s/^\* /  /" actual >expect &&
-	git checkout --orphan HEAD &&
+	git checkout --orphan orphaned-branch &&
 	git for-each-ref --format="%(HEAD) %(refname:short)" refs/heads/ >actual &&
 	test_cmp expect actual
 '

-- 
2.12.0.624.gbb1b07a2c