# HG changeset patch
# User lost@l-w.ca
# Date 1284913667 21600
# Node ID 67815606c5d98ecb03e303248ccb897f0a9d4df8
# Parent  6d87423a979b13cce7afdbb572b73bbcf57eb60b
Prevent NULL deref in lw_expr_destroy

diff -r 6d87423a979b -r 67815606c5d9 lwlib/lw_expr.c
--- a/lwlib/lw_expr.c	Sun Sep 19 01:55:26 2010 -0600
+++ b/lwlib/lw_expr.c	Sun Sep 19 10:27:47 2010 -0600
@@ -91,6 +91,8 @@
 void lw_expr_destroy(lw_expr_t E)
 {
 	struct lw_expr_opers *o;
+	if (!E)
+		return;
 	for (o = E -> operands; o; o = o -> next)
 		lw_expr_destroy(o -> p);
 	if (E -> type == lw_expr_type_var)