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Untangle: forbid descriptions that connect a node to itself

These cause an assertion failure in new_game(), so they should be
rejected by validate_desc().

--- a/untangle.c

+++ b/untangle.c

@@ -755,6 +755,8 @@

 		return "Expected ',' after number in game description";

 	    desc++;		       /* eat comma */

 	}

+        if (a == b)

+            return "Node linked to itself in game description";

     }

     return NULL;