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rio: /dev/label should just ignore offset

We were erroring if offset != 0. Just ignore
the offset.

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

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

@@ -376,7 +376,7 @@

 xfidwrite(Xfid *x)

 {

 	Fcall fc;

-	int cnt, qid, nb, off, nr;

+	int cnt, qid, nb, nr;

 	char err[ERRMAX], *p, *e;

 	Point pt;

 	Window *w;

@@ -393,7 +393,6 @@

 	}

 	qid = FILE(x->f->qid);

 	cnt = x->count;

-	off = x->offset;

 	x->data[cnt] = 0;

 	switch(qid){

 	case Qcons:

@@ -494,10 +493,6 @@

 		break;

 	case Qlabel:

-		if(off != 0){

-			filsysrespond(x->fs, x, &fc, "non-zero offset writing label");

-			return;

-		}

 		p = realloc(w->label, cnt+1);

 		if(p == nil){

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