And more network clean-ups and fixes.

src/network/net_pcap.c

@@ -180,11 +180,6 @@ poll_thread(void *arg)
 	/* Request ownership of the device. */
 	network_wait(1);
 
-#if 0
-	/* Wait for a poll request. */
-	network_poll();
-#endif
-
 	if (pcap == NULL) {
 		network_wait(0);
 		break;
@@ -211,12 +206,9 @@ poll_thread(void *arg)
 		}
 	}
 
-	/* Wait for the next packet to arrive. */
+	/* Wait for the next packet to arrive - network_do_tx() is called from there. */
 	tx = network_tx_queue_check();
 
-	if (tx)
-		network_do_tx();
-
 	/* Release ownership of the device. */
 	network_wait(0);