Corrected a subtle error in "def read" in which if a net declares a

non-default rule, but then does not contain any routed nets, the
non-default rule gets accidentally applied to the next routed net,
ignoring the end-of-statement in between.

VERSION

@@ -1 +1 @@
-8.3.676
+8.3.677

lef/defRead.c

@@ -1115,6 +1115,9 @@ DefReadNets(
 		if (dolabels) netname = StrDup((char **)NULL, token);
 		needanno = annotate;
 
+		/* Any nondefault rule resets at the start of a new net. */
+		ruleset = (LefRules *)NULL;
+
 		/* Update the record of the number of nets processed	*/
 		/* and spit out a message for every 5% finished.	*/