Fix memory leak in an error condition.

We weren't free()-ing test->settings when we bailed out in a
certain error state.

Fixes #1332.

src/iperf_api.c

@@ -2703,6 +2703,7 @@ iperf_new_test()
 
     test->bitrate_limit_intervals_traffic_bytes = (iperf_size_t *) malloc(sizeof(iperf_size_t) * MAX_INTERVAL);
     if (!test->bitrate_limit_intervals_traffic_bytes) {
+        free(test->settings);
         free(test);
 	i_errno = IENEWTEST;
 	return NULL;