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netif: fix wrong qid in 3rd level stats/ifstats files (thanks burnzez)

the stats and ifstats files in the 3rd level of a netif
are not per connection, but for the interface.

this made fstat fail for /net/ether0/N/*stats where N > 0
as the NETID() bits in the qid didnt compare.

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

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

@@ -132,7 +132,7 @@

 		devdir(c, q, "ctl", 0, o, perm, dp);

 		break;

 	case 2:

-		q.path = NETQID(NETID(c->qid.path), Nstatqid);

+		q.path = Nstatqid;

 		devdir(c, q, "stats", 0, eve, 0444, dp);

 		break;

 	case 3:

@@ -140,7 +140,7 @@

 		devdir(c, q, "type", 0, eve, 0444, dp);

 		break;

 	case 4:

-		q.path = NETQID(NETID(c->qid.path), Nifstatqid);

+		q.path = Nifstatqid;

 		devdir(c, q, "ifstats", 0, eve, 0444, dp);

 		break;

 	default: