subtree: t7900: use test-lib.sh's test_count

Use test-lib.sh's `test_count`, instead instead of having
t7900-subtree.sh do its own book-keeping with `subtree_test_count` that
has to be explicitly incremented by calling `next_test`.

Signed-off-by: Luke Shumaker <lukeshu@datawire.io>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Luke Shumaker 2021-04-27 15:17:21 -06:00 committed by Junio C Hamano
parent 914d512551
commit f2bb7fef7a

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