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etherwpi: dont enable transmit power for invalid channels, add multicast stub

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

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

@@ -273,7 +273,7 @@

 		Powergrp pwrgrps[5];

 	} eeprom;

-	char maxpwr[255];

+	char maxpwr[256];

 	Shared *shared;

@@ -535,6 +535,7 @@

 		goto Err;

 	memmove(edev->ea, b, Eaddrlen);

+	memset(ctlr->maxpwr, 0, sizeof(ctlr->maxpwr));

 	for(i = 0; i < nelem(bands); i++){

 		if((err = eepromread(ctlr, b, 2*bands[i].nchan, bands[i].addr)) != nil)

 			goto Err;

@@ -1348,19 +1349,21 @@

 		return;

 	}

-	/* tx power */

-	memset(p = c, 0, sizeof(c));

-	*p++ = 1;	/* band (0 = 5ghz) */

-	p++;		/* reserved */

-	put16(p, ctlr->channel), p += 2;

-	for(rate = 0; rate < nelem(ratetab); rate++){

-		idx = pwridx(ctlr, &ctlr->eeprom.pwrgrps[0], ctlr->channel, rate);

-		*p++ = ratetab[rate].plcp;

-		*p++ = rfgain_2ghz[idx];	/* rf_gain */

-		*p++ = dspgain_2ghz[idx];	/* dsp_gain */

-		p++;		/* reservd */

+	if(ctlr->maxpwr[ctlr->channel] != 0){

+		/* tx power */

+		memset(p = c, 0, sizeof(c));

+		*p++ = 1;	/* band (0 = 5ghz) */

+		p++;		/* reserved */

+		put16(p, ctlr->channel), p += 2;

+		for(rate = 0; rate < nelem(ratetab); rate++){

+			idx = pwridx(ctlr, &ctlr->eeprom.pwrgrps[0], ctlr->channel, rate);

+			*p++ = ratetab[rate].plcp;

+			*p++ = rfgain_2ghz[idx];	/* rf_gain */

+			*p++ = dspgain_2ghz[idx];	/* dsp_gain */

+			p++;		/* reservd */

+		}

+		cmd(ctlr, 151, c, p - c);

 	}

-	cmd(ctlr, 151, c, p - c);

 	if(ctlr->bcastnodeid == -1){

 		ctlr->bcastnodeid = 24;

@@ -1526,6 +1529,11 @@

 }

 static void

+wpimulticast(void *, uchar*, int)

+{

+}

+

+static void

 wpirecover(void *arg)

 {

 	Ether *edev;

@@ -1846,7 +1854,7 @@

 	edev->ctl = wpictl;

 	edev->shutdown = wpishutdown;

 	edev->promiscuous = wpipromiscuous;

-	edev->multicast = nil;

+	edev->multicast = wpimulticast;

 	edev->mbps = 54;

 	if(wpiinit(edev) < 0){