RFR: JDK-8265496: improve null check in DeflaterOutputStream/InflaterInputStream [v2]

[Hamlin Li]

On Mon, 26 Apr 2021 02:36:54 GMT, Hamlin Li <mli at openjdk.org> wrote:

>> code like below will create Deflater before null check, although it's not a real mem leak, but it's better to do null check before new Deflater.
>> 
>>         try {
>>             DeflaterOutputStream dos = new DeflaterOutputStream(null);
>>         } catch (NullPointerException e) {
>>             passed = true;
>>         }
>> Similar issues exist in several other classes.
>
> Hamlin Li has updated the pull request incrementally with one additional commit since the last revision:
> 
>   update copyrights.

It's changed by another patch sometimes ago, but I missed to update the copyright.

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PR: https://git.openjdk.java.net/jdk/pull/3681