t5325: mark as leak-free

This test is leak-free as of the previous commit, so let's mark it as
such to ensure we don't regress and introduce a leak in the future.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Acked-by: Derrick Stolee <derrickstolee@github.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t5325-reverse-index.sh

@@ -1,6 +1,8 @@
 #!/bin/sh
 
 test_description='on-disk reverse index'
+
+TEST_PASSES_SANITIZE_LEAK=true
 . ./test-lib.sh
 
 # The below tests want control over the 'pack.writeReverseIndex' setting