ztest: mock: Fix typo

"Return value no used by mock" should be
"Return value not used by mock".

Signed-off-by: Tom Hughes <[email protected]>

Author: thughes

subsys/testsuite/ztest/src/ztest_mock.c

@@ -329,7 +329,7 @@ int z_cleanup_mock(void)
 		fail = 1;
 	}
 	if (return_value_list.next) {
-		PRINT_DATA("Return value no used by mock: %s\n", return_value_list.next->fn);
+		PRINT_DATA("Return value not used by mock: %s\n", return_value_list.next->fn);
 		fail = 2;
 	}