Added a cast to avoid a compiler warning.

src/iperf_api.c

@@ -755,7 +755,7 @@ int
 iperf_set_send_state(struct iperf_test *test, signed char state)
 {
     test->state = state;
-    if (Nwrite(test->ctrl_sck, &state, sizeof(state), Ptcp) < 0) {
+    if (Nwrite(test->ctrl_sck, (char*) &state, sizeof(state), Ptcp) < 0) {
 	i_errno = IESENDMESSAGE;
 	return -1;
     }

src/iperf_client_api.c

@@ -171,6 +171,7 @@ iperf_handle_message_client(struct iperf_test *test)
     int rval;
     int32_t err;
 
+    /*!!! Why is this read() and not Nread()? */
     if ((rval = read(test->ctrl_sck, (char*) &test->state, sizeof(signed char))) <= 0) {
         if (rval == 0) {
             i_errno = IECTRLCLOSE;