[PATCH] t4200: drop irrelevant code

["Martin Ågren" <martin.agren@gmail.com>]

While setting up an unresolved merge for `git rerere`, we run `git
rev-parse` and `git fmt-merge-msg` to create a variable `$fifth` and a
commit-message file `msg`, which we then never actually use. This has
been like that since these tests were added in 672d1b789b ("rerere:
migrate to parse-options API", 2010-08-05). This does exercise `git
rev-parse` and `git fmt-merge-msg`, but doesn't contribute to testing
`git rerere`. Drop these lines.

Reported-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Martin Ågren <martin.agren@gmail.com>
---
 This is quite late fallout from Eric's review [1] of some commits that
 have already gone in.

 [1] https://lore.kernel.org/git/CAPig+cSjHg2-WYqdkZAS0ye1goj_=5RN3mdjt0-4kSBqNm6WLg@mail.gmail.com/

 t/t4200-rerere.sh | 3 ---
 1 file changed, 3 deletions(-)

diff --git a/t/t4200-rerere.sh b/t/t4200-rerere.sh
index 9f8c76dffb..7025cfdae5 100755
--- a/t/t4200-rerere.sh
+++ b/t/t4200-rerere.sh
@@ -358,23 +358,20 @@ test_expect_success 'set up an unresolved merge' '
 	headblob=$(git rev-parse version2:file3) &&
 	mergeblob=$(git rev-parse fifth:file3) &&
 	cat >expected.unresolved <<-EOF &&
 	100644 $headblob 2	file3
 	100644 $mergeblob 3	file3
 	EOF
 
 	test_might_fail git config --unset rerere.autoupdate &&
 	git reset --hard &&
 	git checkout version2 &&
-	fifth=$(git rev-parse fifth) &&
-	echo "$fifth		branch fifth of ." |
-	git fmt-merge-msg >msg &&
 	ancestor=$(git merge-base version2 fifth) &&
 	test_must_fail git merge-recursive "$ancestor" -- HEAD fifth &&
 
 	git ls-files --stage >failedmerge &&
 	cp file3 file3.conflict &&
 
 	git ls-files -u >actual &&
 	test_cmp expected.unresolved actual
 '
 
-- 
2.37.1.373.g4dd4a117ec