[LTP] [PATCH v4] open: fix cleanup condition and use snprintf

[Andrea Cervesato]

Hi!

Since we are cleaning up the test, we can just do this instead:

static void cleanup(void)
{
	if (first >= 0) {
		int limit = fds_limit - first;

		for (int i = 0; i < limit; i++) {
			if (fds[i] != -1)
				SAFE_CLOSE(fds[i]);
		}
	}

	free(fds);
}

We don't need to calculate the index twice every iteration. Also, free(NULL)
is noop and we can safely call it without checking if it's NULL.

And please remove the `i` definition at static level. We don't really need that.
We can safely use `for (int i = 0`.

Regards,
--
Andrea Cervesato
SUSE QE Automation Engineer Linux
andrea.cervesato@suse.com