selftests/cgroup: read and write size_t with %zu in test_zswap

On 32-bit architectures size_t is an unsigned int, and reading and
writing it with %ld warns:

  test_zswap.c:34:29: warning: format '%ld' expects argument of type 'long int *', but argument 3 has type 'size_t *' {aka 'unsigned int *'} [-Wformat=]

Use %zu.

Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Tejun Heo <tj@kernel.org>

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