t/README: Add a note about running commands under valgrind

diff --git a/t/t5300-pack-object.sh b/t/t5300-pack-object.sh
index bbb9c1251d97bdaf5bca8f8260e481c3cac56dea..602806d09cda72c7bf0f407da35b2fb859404bd7 100755 (executable)
--- a/t/t5300-pack-object.sh
+++ b/t/t5300-pack-object.sh
@@ -12,7 +12,7 @@ TRASH=`pwd`
 
 test_expect_success \
     'setup' \
-    'rm -f .git/index*
+    'rm -f .git/index* &&
      perl -e "print \"a\" x 4096;" > a &&
      perl -e "print \"b\" x 4096;" > b &&
      perl -e "print \"c\" x 4096;" > c &&