t/t7509: remove unnecessary manipulation of reflog

Remove unnecessary reflog manipulation.  The test does not rely in any
way on this reflog manipulation, and the case that the test
exercises is unrelated to reflogs.

Signed-off-by: David Turner <dturner@twopensource.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t7509-commit.sh

@@ -90,22 +90,10 @@ sha1_file() {
 remove_object() {
 	rm -f $(sha1_file "$*")
 }
-no_reflog() {
-	cp .git/config .git/config.saved &&
-	echo "[core] logallrefupdates = false" >>.git/config &&
-	test_when_finished "mv -f .git/config.saved .git/config" &&
-
-	if test -e .git/logs
-	then
-		mv .git/logs . &&
-		test_when_finished "mv logs .git/"
-	fi
-}
 
 test_expect_success '--amend option with empty author' '
 	git cat-file commit Initial >tmp &&
 	sed "s/author [^<]* </author  </" tmp >empty-author &&
-	no_reflog &&
 	sha=$(git hash-object -t commit -w empty-author) &&
 	test_when_finished "remove_object $sha" &&
 	git checkout $sha &&
@@ -119,7 +107,6 @@ test_expect_success '--amend option with empty author' '
 test_expect_success '--amend option with missing author' '
 	git cat-file commit Initial >tmp &&
 	sed "s/author [^<]* </author </" tmp >malformed &&
-	no_reflog &&
 	sha=$(git hash-object -t commit -w malformed) &&
 	test_when_finished "remove_object $sha" &&
 	git checkout $sha &&