6717680: LdapCtx does not close the connection if initialization fails

Reviewed-by: vinnie, xuelei

src/share/classes/com/sun/jndi/ldap/LdapCtx.java

@@ -302,7 +302,16 @@ final public class LdapCtx extends ComponentDirContext
 
         schemaTrees = new Hashtable(11, 0.75f);
         initEnv();
+        try {
             connect(false);
+        } catch (NamingException e) {
+            try {
+                close();
+            } catch (Exception e2) {
+                // Nothing
+            }
+            throw e;
+        }
     }
 
     LdapCtx(LdapCtx existing, String newDN) throws NamingException {