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rio: fix cons read breakage from previous commit

--- a/sys/src/cmd/rio/wind.c

+++ b/sys/src/cmd/rio/wind.c

@@ -406,7 +406,7 @@

 			t = "notcurrent";

 			if(w == input)

 				t = "current";

-			pair.ns = snprint(pair.s, pair.ns, "%11d %11d %11d %11d %11s %11s ",

+			pair.ns = snprint(pair.s, pair.ns+1, "%11d %11d %11d %11d %11s %11s ",

 				w->i->r.min.x, w->i->r.min.y, w->i->r.max.x, w->i->r.max.y, t, s);

 			send(crm.c2, &pair);

 			continue;

--- a/sys/src/cmd/rio/xfid.c

+++ b/sys/src/cmd/rio/xfid.c

@@ -670,9 +670,9 @@

 		}

 		c1 = crm.c1;

 		c2 = crm.c2;

-		pair.ns = cnt+UTFmax+1;	/* room for partial rune and null byte */

-		t = emalloc(pair.ns);

+		t = emalloc(cnt+UTFmax+1);	/* room to unpack partial rune plus */

 		pair.s = t;

+		pair.ns = cnt;

 		send(c1, &pair);

 		recv(c2, &pair);

 		fc.data = pair.s;