RFR: 8149450: LdapCtx.processReturnCode() throwing Null Pointer Exception

[Sean Coffey]

Looking to fix this issue. Better checks for the referrrals field.

bugID : https://bugs.openjdk.java.net/browse/JDK-8149450
webrev : http://cr.openjdk.java.net/~coffeys/webrev.8149450.jdk9/webrev/

regards,
Sean.