Fix issue 692 (#705)

Don't count data for tests received after the end of a test.
This prevents is from reporting an incorrect number of bytes
received at the end of the test, which doesn't match up with the
sum of the data received during the test intervals.
Log late receives if debugging mode enabled.

Fixes #692.

src/iperf_sctp.c

@@ -63,8 +63,15 @@ iperf_sctp_recv(struct iperf_stream *sp)
     if (r < 0)
         return r;
 
+    /* Only count bytes received while we're in the correct state. */
+    if (sp->test->state == TEST_RUNNING) {
 	sp->result->bytes_received += r;
 	sp->result->bytes_received_this_interval += r;
+    }
+    else {
+	if (sp->test->debug)
+	    printf("Late receive, state = %d\n", sp->test->state);
+    }
 
     return r;
 #else

src/iperf_tcp.c

@@ -60,8 +60,15 @@ iperf_tcp_recv(struct iperf_stream *sp)
     if (r < 0)
         return r;
 
+    /* Only count bytes received while we're in the correct state. */
+    if (sp->test->state == TEST_RUNNING) {
 	sp->result->bytes_received += r;
 	sp->result->bytes_received_this_interval += r;
+    }
+    else {
+	if (sp->test->debug)
+	    printf("Late receive, state = %d\n", sp->test->state);
+    }
 
     return r;
 }

src/iperf_udp.c

@@ -1,5 +1,5 @@
 /*
- * iperf, Copyright (c) 2014, 2016, 2017, The Regents of the University of
+ * iperf, Copyright (c) 2014-2018, The Regents of the University of
  * California, through Lawrence Berkeley National Laboratory (subject
  * to receipt of any required approvals from the U.S. Dept. of
  * Energy).  All rights reserved.
@@ -78,6 +78,8 @@ iperf_udp_recv(struct iperf_stream *sp)
     if (r <= 0)
         return r;
 
+    /* Only count bytes received while we're in the correct state. */
+    if (sp->test->state == TEST_RUNNING) {
 	sp->result->bytes_received += r;
 	sp->result->bytes_received_this_interval += r;
 
@@ -169,6 +171,11 @@ iperf_udp_recv(struct iperf_stream *sp)
 	    d = -d;
 	sp->prev_transit = transit;
 	sp->jitter += (d - sp->jitter) / 16.0;
+    }
+    else {
+	if (sp->test->debug)
+	    printf("Late receive, state = %d\n", sp->test->state);
+    }
 
     return r;
 }