lib/net.c: fixed jump in linearize_rx_timestamp() when phase == transition_point.

After subtraction of transition value from linearized phase, the phase value was renormalized to 0...clock_period-1, but
not the other counters. This resulted in very rare 8ns jumps.

lib/net.c

@@ -167,9 +167,20 @@ void ptpd_netif_linearize_rx_timestamp(wr_timestamp_t * ts, int32_t dmtd_phase,
 
 	}
 
-	ts->phase = phase - transition_point - 1;
-	if (ts->phase < 0)
+	ts->phase = phase - transition_point;
+
+	/* normalize timestamp after subtraction */
+	if(ts->phase < 0)
+	{
 		ts->phase += clock_period;
+		ts->nsec -= clock_period / 1000;
+	}
+	
+	if(ts->nsec < 0)
+	{
+		ts->nsec += 1000000000;
+		ts->sec--;
+	}
 }
 
 /* Slow, but we don't care much... */