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libframe: avoid _frcanfit() call in frdelete()

no need to calculate number of runes to fit in
box when box contains no runes.

--- a/sys/src/libframe/frdelete.c

+++ b/sys/src/libframe/frdelete.c

@@ -46,13 +46,13 @@

 	while(pt1.x!=pt0.x && n1<f->nbox){

 		_frcklinewrap0(f, &pt0, b);

 		_frcklinewrap(f, &pt1, b);

-		n = _frcanfit(f, pt0, b);

-		if(n==0)

-			drawerror(f->display, "_frcanfit==0");

 		r.min = pt0;

 		r.max = pt0;

 		r.max.y += f->font->height;

 		if(b->nrune > 0){

+			n = _frcanfit(f, pt0, b);

+			if(n==0)

+				drawerror(f->display, "_frcanfit==0");

 			if(n != b->nrune){

 				_frsplitbox(f, n1, n);

 				b = &f->box[n1];

-- 

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