t6030: don't create unused file

my_bisect_log3.txt was added by c9c4e2d (bisect: only check merge
bases when needed, 2008-08-22), but hasn't been used then and since.
Get rid of it.

Signed-off-by: René Scharfe <l.s.r@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t6030-bisect-porcelain.sh

@@ -482,7 +482,7 @@ test_expect_success 'optimized merge base checks' '
 	git bisect good > my_bisect_log2.txt &&
 	test -f ".git/BISECT_ANCESTORS_OK" &&
 	test "$HASH6" = $(git rev-parse --verify HEAD) &&
-	git bisect bad > my_bisect_log3.txt &&
+	git bisect bad &&
 	git bisect good "$A_HASH" > my_bisect_log4.txt &&
 	test_i18ngrep "merge base must be tested" my_bisect_log4.txt &&
 	test_must_fail test -f ".git/BISECT_ANCESTORS_OK"