hg: jdk/jdk: 8243424: Signature and SignatureSpi get parameter methods may return null when unsupported

[anthony.scarpino at oracle.com]

Changeset: e0cd01ac5d31
Author:    ascarpino
Date:      2020-06-08 10:45 -0700
URL:       https://hg.openjdk.java.net/jdk/jdk/rev/e0cd01ac5d31

8243424: Signature and SignatureSpi get parameter methods may return null when unsupported
Reviewed-by: mullan

! src/java.base/share/classes/java/security/Signature.java
! src/java.base/share/classes/java/security/SignatureSpi.java