[PATCH] Fix t3411.3 to actually rebase something

The test intends to rebase a branchy history onto a later commit, but it
forgot to reset HEAD back to an earlier commit before it set up the side
branches. In the end, every "rebased" commit was only a fast-forward and
the 'rebase -p' did not change the commit graph at all. Insert the missing
checkout that moves to an earlier commit.

Signed-off-by: Johannes Sixt <redacted>
---
 Noticed while I was working on replacing 'git merge' by 'git
 cherry-pick' in the rebase -p code path.

 t/t3411-rebase-preserve-around-merges.sh | 1 +
 1 file changed, 1 insertion(+)

diff --git a/t/t3411-rebase-preserve-around-merges.sh

b/t/t3411-rebase-preserve-around-merges.sh
index ace8e54..dc81bf2 100755

--- a/t/t3411-rebase-preserve-around-merges.sh
+++ b/t/t3411-rebase-preserve-around-merges.sh

@@ -56,6 +56,7 @@ test_expect_success 'squash F1 into D1' '
 # And rebase G1..M1 onto E2

 test_expect_success 'rebase two levels of merge' '
+	git checkout A1 &&
 	test_commit G1 &&
 	test_commit H1 &&
 	test_commit I1 &&

-- 
1.7.10.2.529.g0c18cfd