t4205: drop top-level &&-chaining

t4205: drop top-level &&-chaining

The test currently does something like:

  do_one() &&
  do_two() &&
  test_expect_success ...

We generally avoid performing actions at the top-level of
the script (outside of a test_expect block) for two reasons:

  1. The test harness is not checking and reporting if they
     fail.

  2. Their output is not handled correctly (not hidden by
     default, nor shown with "-v").

Using &&-chains seems like it should help with (1), but it
doesn't. If either of the commands fails, we simply skip
running the follow-on test entirely, and the test harness
has no idea.

We can fix this by pushing that setup into its own block.
It _could_ go into the following test block, but since the
result in this case is used by multiple tests, it's more
clear to mark it explicitly as a distinct setup step.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>