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nusb/ether: set configuration, and use the first interface that matches

before, we were parsing all configurations, to find the cdc union,
but we would not set the config. this means we would try to talk cdc ethernet to whatever the first configuration is.

this makes cdc ethernet work on my rtl8156.

--- a/sys/src/cmd/nusb/ether/ether.c

+++ b/sys/src/cmd/nusb/ether/ether.c

@@ -642,15 +642,18 @@

 		ctlif = datif = nil;

 		for(j = 0; j < nelem(c->iface); j++){

 			for(iface = c->iface[j]; iface != nil; iface = iface->next){

-				if(iface->id == ctlid)

+				if(ctlif == nil && iface->id == ctlid)

 					ctlif = iface;

-				if(iface->id == datid)

+				if(datif == nil && iface->id == datid)

 					datif = iface;

 			}

 			if(datif != nil && ctlif != nil){

-				if(Subclass(ctlif->csp) == Scether)

+				if(Subclass(ctlif->csp) == Scether) {

+					if(setconf(d, c) < 0)

+						break;

 					if(ifaceinit(d, datif, ein, eout) != -1)

 						return 0;

+				}

 				break;

 			}

 		}		

@@ -659,6 +662,8 @@

 	/* try any other one that seems to be ok */

 	for(i = 0; i < nelem(ud->conf); i++){

 		if((c = ud->conf[i]) != nil){

+			if(setconf(d, c) < 0)

+				break;

 			for(j = 0; j < nelem(c->iface); j++){

 				for(datif = c->iface[j]; datif != nil; datif = datif->next){

 					if(ifaceinit(d, datif, ein, eout) != -1)

-- 

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