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rio: more pointy edges with none attach

Would crash when reading from wctl in riostart.

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

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

@@ -293,7 +293,7 @@

 			ntsnarf = 0;

 		break;

 	case Qwctl:

-		if(x->mode==OREAD || x->mode==ORDWR){

+		if(w != nil && (x->mode==OREAD || x->mode==ORDWR)){

 			/*

 			 * It would be much nicer to implement fan-out for wctl reads,

 			 * so multiple people can see the resizings, but rio just isn't

@@ -365,7 +365,7 @@

 		}

 		break;

 	case Qwctl:

-		if(x->f->mode==OREAD || x->f->mode==ORDWR)

+		if(w != nil && (x->f->mode==OREAD || x->f->mode==ORDWR))

 			w->wctlopen = FALSE;

 		break;

 	case Qtap:

-- 

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