tests: posix: semaphores: coalesce string constants

Just a formatting change, in a separate commit.

Signed-off-by: Chris Friedt <cfriedt@tenstorrent.com>

Author: cfriedt

tests/posix/semaphores/src/main.c

@@ -71,9 +71,7 @@ static void semaphore_test(sem_t *sem)
 	zassert_equal(sem_getvalue(sem, &val), 0);
 	zassert_equal(val, 1);
 
-	zassert_equal(sem_destroy(sem), -1,
-		      "acquired semaphore"
-		      " is destroyed");
+	zassert_equal(sem_destroy(sem), -1, "acquired semaphore is destroyed");
 	zassert_equal(errno, EBUSY);
 
 	/* TESTPOINT: take semaphore which is initialized with 1 */