t4060: remove unused variable

Signed-off-by: David Turner <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Author: novalis

t/t4060-diff-submodule-option-diff-format.sh

@@ -361,7 +361,6 @@ test_expect_success 'typechanged submodule(submodule->blob)' '
 rm -f sm1 &&
 test_create_repo sm1 &&
 head6=$(add_file sm1 foo6 foo7)
-fullhead6=$(cd sm1; git rev-parse --verify HEAD)
 test_expect_success 'nonexistent commit' '
 	git diff-index -p --submodule=diff HEAD >actual &&
 	cat >expected <<-EOF &&