Use a different way to silence clang analyzer as done in r245494 by

explicitly telling the compiler that we are on the exit route.

X-MFC:	together with r245494

bin/pwait/pwait.c

@@ -141,6 +141,5 @@ main(int argc, char *argv[])
 		nleft -= n;
 	}
 
-	free(e);
-	return 0;
+	exit(EX_OK);
 }