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resize: fix division by zero

--- a/sys/src/cmd/resize.c

+++ b/sys/src/cmd/resize.c

@@ -19,8 +19,12 @@

 	bpp = src->depth/8;

 	bpl = src->width*sizeof(int);

-	qp.x = (ssize.x<<12)/dsize.x;

-	qp.y = (ssize.y<<12)/dsize.y;

+	qp = Pt(0, 0);

+	if(dsize.x > 0)

+		qp.x = (ssize.x<<12)/dsize.x;

+	if(dsize.y > 0)

+		qp.y = (ssize.y<<12)/dsize.y;

+

 	_sp.y = sr.min.y<<12;

 	for(dp.y=0; dp.y<=dsize.y; dp.y++){

 		sp.y = _sp.y>>12;

-- 

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