p3400 makes a copy of the current repository to test git-rebase
performance, and creates new branches in the copy with `git checkout
-b'.  If the original repository has branches with the same name as the
script is trying to create, this operation will fail.

This replaces these calls by `git checkout -B' to force the creation and
update of these branches.

Signed-off-by: Alban Gruin <alban.gr...@gmail.com>
---
 t/perf/p3400-rebase.sh | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/t/perf/p3400-rebase.sh b/t/perf/p3400-rebase.sh
index ce271ca4c1..d202aaed06 100755
--- a/t/perf/p3400-rebase.sh
+++ b/t/perf/p3400-rebase.sh
@@ -6,9 +6,9 @@ test_description='Tests rebase performance'
 test_perf_default_repo
 
 test_expect_success 'setup rebasing on top of a lot of changes' '
-       git checkout -f -b base &&
-       git checkout -b to-rebase &&
-       git checkout -b upstream &&
+       git checkout -f -B base &&
+       git checkout -B to-rebase &&
+       git checkout -B upstream &&
        for i in $(seq 100)
        do
                # simulate huge diffs
@@ -35,8 +35,8 @@ test_perf 'rebase on top of a lot of unrelated changes' '
 
 test_expect_success 'setup rebasing many changes without split-index' '
        git config core.splitIndex false &&
-       git checkout -b upstream2 to-rebase &&
-       git checkout -b to-rebase2 upstream
+       git checkout -B upstream2 to-rebase &&
+       git checkout -B to-rebase2 upstream
 '
 
 test_perf 'rebase a lot of unrelated changes without split-index' '
-- 
2.19.1

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