[PATCH] Use the modern syntax of git-diff-files in t2002-checkout-cache-u.sh

[Alex Riesen <raa.lkml@gmail.com>]

As a nice side effect it also fixes t2002-checkout-cache-u.sh on FreeBSD 4,
/bin/sh of which has problems interpreting "! command" construction.

Signed-off-by: Alex Riesen <raa.lkml@gmail.com>
---

To be honest - it was the other way around: I wanted to fix the test
on FreeBSD, but ended up using --exit-code and test_must_fail

 t/t2002-checkout-cache-u.sh |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/t/t2002-checkout-cache-u.sh b/t/t2002-checkout-cache-u.sh
index 0f441bc..70361c8 100755
--- a/t/t2002-checkout-cache-u.sh
+++ b/t/t2002-checkout-cache-u.sh
@@ -21,13 +21,13 @@ test_expect_success \
 rm -f path0 &&
 git read-tree $t &&
 git checkout-index -f -a &&
-! git diff-files | diff - /dev/null'
+test_must_fail git diff-files --exit-code'
 
 test_expect_success \
 'with -u, git checkout-index picks up stat information from new files.' '
 rm -f path0 &&
 git read-tree $t &&
 git checkout-index -u -f -a &&
-git diff-files | diff - /dev/null'
+git diff-files --exit-code'
 
 test_done
-- 
1.5.5.1.113.g4af4