fixed memory leak in c14n code

* c14n.c: fixed memory leak in c14n code
diff --git a/c14n.c b/c14n.c
index 2b61fd7..f10066e 100644
--- a/c14n.c
+++ b/c14n.c
@@ -167,6 +167,10 @@
 	memset(cur->nsTab, 0, cur->nsMax * sizeof(xmlNsPtr));
 	xmlFree(cur->nsTab);
     }
+    if(cur->nodeTab != NULL) {
+	memset(cur->nodeTab, 0, cur->nsMax * sizeof(xmlNodePtr));
+	xmlFree(cur->nodeTab);
+    }
     memset(cur, 0, sizeof(xmlC14NVisibleNsStack));
     xmlFree(cur);