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ico: avoid potential nil pointer dereferences

Bgeticon can fail, leaving the Icon img pointers nil.

--- a/sys/src/cmd/jpg/ico.c

+++ b/sys/src/cmd/jpg/ico.c

@@ -535,6 +535,8 @@

 	r.max.x = screen->r.min.x;

 	r.min.y = screen->r.min.y + font->height + 2*BORDER;

 	for(icon = h.first; icon != nil; icon = icon->next){

+		if(icon->img == nil)

+			continue;

 		r.min.x = r.max.x + BORDER;

 		r.max.x = r.min.x + Dx(icon->img->r);

 		r.max.y = r.min.y + Dy(icon->img->r);