tests/pthread_cleanup: small improvements

tests/pthread_cleanup/main.c

@@ -60,7 +60,7 @@ static void *run(void *unused) {
 }
 
 int main(void) {
-    puts("Start.");
+    puts("START");
 
     pthread_t th_id;
     pthread_create(&th_id, NULL, run, NULL);
@@ -69,6 +69,12 @@ int main(void) {
     pthread_join(th_id, (void **) &res);
 
     printf("Result: %i\n", (int) (intptr_t) res);
-    puts("Done.");
+
+    if (res == RET_EXIT) {
+        puts("SUCCESS");
+    }
+    else {
+        puts("FAILURE");
+    }
     return 0;
 }