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rio: use libdraw's badrect() to exclude some extreme cases in goodrect()

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

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

@@ -88,7 +88,7 @@

 int

 goodrect(Rectangle r)

 {

-	if(!eqrect(canonrect(r), r))

+	if(badrect(r) || !eqrect(canonrect(r), r))

 		return 0;

 	/* reasonable sizes only please */

 	if(Dx(r) > BIG*Dx(screen->r))