Revert "tests: posix: pthread: init pthread_attr_t on each iteration"

This reverts commit 7c17bda.

Signed-off-by: Christopher Friedt <[email protected]>

Author: Christopher Friedt

tests/posix/common/src/pthread.c

@@ -587,10 +587,11 @@ ZTEST(posix_apis, test_pthread_descriptor_leak)
 	pthread_t pthread1;
 	pthread_attr_t attr;
 
+	zassert_ok(pthread_attr_init(&attr));
+	zassert_ok(pthread_attr_setstack(&attr, &stack_e[0][0], STACKS));
+
 	/* If we are leaking descriptors, then this loop will never complete */
 	for (size_t i = 0; i < CONFIG_MAX_PTHREAD_COUNT * 2; ++i) {
-		zassert_ok(pthread_attr_init(&attr));
-		zassert_ok(pthread_attr_setstack(&attr, &stack_e[0][0], STACKS));
 		zassert_ok(pthread_create(&pthread1, &attr, create_thread1, NULL),
 			   "unable to create thread %zu", i);
 		zassert_ok(pthread_join(pthread1, NULL), "unable to join thread %zu", i);