Vendor fix: initialize the flag field of a newly created node to be 0.

Submitted by:	jasone

contrib/bsnmp/gensnmptree/gensnmptree.c

@@ -353,6 +353,7 @@ parse(enum tok tok)
 
 	node = xalloc(sizeof(struct node));
 	node->lno = lno;
+	node->flags = 0;
 
 	if (tok != '(')
 		report("'(' expected at begin of node");