Added a check for malloc fail.

Eventually we need to add a whole bunch more of these.

src/iperf_api.c

@@ -1363,6 +1363,11 @@ iperf_new_test()
     memset(test, 0, sizeof(struct iperf_test));
 
     test->settings = (struct iperf_settings *) malloc(sizeof(struct iperf_settings));
+    if (!test->settings) {
+        free(test);
+	i_errno = IENEWTEST;
+	return NULL;
+    }
     memset(test->settings, 0, sizeof(struct iperf_settings));
 
     return test;