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devether: print mbps only on link-up

To avoid frequent prints of the current link speed,
which in case of wifi is adjusted based link quality,
print the link speed only on link up events.

--- a/sys/src/9/port/devether.c

+++ b/sys/src/9/port/devether.c

@@ -475,7 +475,6 @@

 		return;

 	netifsetlimit(ether, etherqueuesize(ether));

 	qsetlimit(ether->oq, ether->limit);

-	print("#l%d: %s: speed %dMbps\n", ether->ctlrno, ether->type, mbps);

 }

 void

@@ -485,7 +484,12 @@

 	if(!!ether->link == link)

 		return;

 	ether->link = link;

-	print("#l%d: %s: link %s\n", ether->ctlrno, ether->type, link? "up": "down");

+	if(link)

+		print("#l%d: %s: link up: %dMbps\n",

+			ether->ctlrno, ether->type, ether->mbps);

+	else

+		print("#l%d: %s: link down\n",

+			ether->ctlrno, ether->type);

 }

 static void netconsole(int);

-- 

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