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wifi: set ether->mbps to highest supported rate of the associated ap

--- a/sys/src/9/pc/wifi.c

+++ b/sys/src/9/pc/wifi.c

@@ -654,6 +654,7 @@

 	Wnode wnscan;

 	Wnode *wn;

 	ulong now, tmout;

+	uchar *rate;

 	wifi = arg;

 	ether = wifi->ether;

@@ -677,6 +678,8 @@

 	tmout = 0;

 	while((wn = wifi->bss) != nil){

 		ether->link = (wn->status == Sassoc) || (wn->status == Sblocked);

+		if(ether->link && (rate = wn->maxrate) != nil)

+			ether->mbps = ((*rate & 0x7f)+1)/2;

 		now = MACHP(0)->ticks;

 		if(wn->status != Sneedauth && TK2SEC(now - wn->lastseen) > 60 || goodbss(wifi, wn) == 0){

 			wifideauth(wifi, wn);