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games/turtle: do exit instead of crash in redraw() when there where no lines drawn

--- a/sys/src/games/turtle.c

+++ b/sys/src/games/turtle.c

@@ -169,6 +169,8 @@

 		if(s == nil) break;

 		runline(s);

 	}

+	if(lines == nil)

+		exits(nil);

 	if(initdraw(nil, nil, nil) < 0)

 		sysfatal("initdraw: %r");

-- 

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