tests: posix: rename shadow variables

Rename shadow variables found by -Wshadow.

Signed-off-by: Daniel Leung <daniel.leung@intel.com>

Author: dcpleung

tests/posix/common/src/sleep.c

@@ -12,7 +12,7 @@ struct waker_work {
 	k_tid_t tid;
 	struct k_work_delayable dwork;
 };
-static struct waker_work ww;
+static struct waker_work wake_work;
 
 static void waker_func(struct k_work *work)
 {
@@ -49,9 +49,9 @@ ZTEST(posix_apis, test_sleep)
 	zassert_true((now - then) >= 2 * MSEC_PER_SEC);
 
 	/* test that sleep reports the remainder */
-	ww.tid = k_current_get();
-	k_work_init_delayable(&ww.dwork, waker_func);
-	zassert_equal(1, k_work_schedule(&ww.dwork, K_SECONDS(sleep_min_s)));
+	wake_work.tid = k_current_get();
+	k_work_init_delayable(&wake_work.dwork, waker_func);
+	zassert_equal(1, k_work_schedule(&wake_work.dwork, K_SECONDS(sleep_min_s)));
 	zassert_true(sleep(sleep_max_s) >= sleep_rem_s);
 }
 
@@ -80,9 +80,9 @@ ZTEST(posix_apis, test_usleep)
 	zassert_equal(errno, EINVAL);
 
 	/* test that sleep reports errno = EINTR when woken up */
-	ww.tid = k_current_get();
-	k_work_init_delayable(&ww.dwork, waker_func);
-	zassert_equal(1, k_work_schedule(&ww.dwork, K_USEC(USEC_PER_SEC / 2)));
+	wake_work.tid = k_current_get();
+	k_work_init_delayable(&wake_work.dwork, waker_func);
+	zassert_equal(1, k_work_schedule(&wake_work.dwork, K_USEC(USEC_PER_SEC / 2)));
 	zassert_equal(-1, usleep(USEC_PER_SEC - 1));
 	zassert_equal(EINTR, errno);
 }