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devether: must not loop-back packets from bypass

ethermux() must handle a packet from bypass the same as if it
was received physically (from == nil).

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

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

@@ -202,7 +202,7 @@

 	x = nil;

 	type = (pkt->type[0]<<8)|pkt->type[1];

-	dispose = tome || from == nil || port > 0;

+	dispose = tome || from == nil || port > 0 || (*from)->bypass;

 	for(fp = ether->f; fp < &ether->f[Ntypes]; fp++){

 		if((f = *fp) == nil)

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

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

@@ -796,7 +796,7 @@

 	x = nil;

 	type = (pkt->type[0]<<8)|pkt->type[1];

-	dispose = tome || from == nil || port > 0;

+	dispose = tome || from == nil || port > 0 || from->bypass;

 	for(c = conn; c < &conn[nconn]; c++){

 		if(!c->used)