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rio: return 'global' size for none /dev/wctl read (thanks umbraticus)

Before we were just erroring, this provides something useful giving
the total size of the rio to the riostart script.

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

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

@@ -657,8 +657,14 @@

 	switch(qid){

 	case Qwctl:

 		if(w == nil){

-			filsysrespond(x->fs, x, &fc, "no window");

-			return;

+			if(off >= 6*12){

+				filsysrespond(x->fs, x, &fc, "no window");

+				return;

+			}

+			n = sprint(buf, "%11d %11d %11d %11d nowindow    nowindow    ",

+				screen->r.min.x, screen->r.min.y, screen->r.max.x, screen->r.max.y);

+			t = estrdup(buf);

+			goto Text;

 		}

 		if(cnt < 4*12){

 			filsysrespond(x->fs, x, &fc, Etooshort);