RFR: 8296024: Usage of DIrectBuffer::address should be guarded [v6]

[Per Minborg]

On Mon, 21 Nov 2022 14:14:14 GMT, Alan Bateman <alanb at openjdk.org> wrote:

>> Per Minborg has updated the pull request incrementally with two additional commits since the last revision:
>> 
>>  - Update src/java.base/share/classes/jdk/internal/access/JavaNioAccess.java
>>    
>>    Co-authored-by: ExE Boss <3889017+ExE-Boss at users.noreply.github.com>
>>  - Update src/java.base/share/classes/sun/nio/ch/DirectBuffer.java
>>    
>>    Co-authored-by: ExE Boss <3889017+ExE-Boss at users.noreply.github.com>
>
> src/java.base/share/classes/sun/nio/fs/NativeBuffers.java line 92:
> 
>> 90:      * allocated from the heap.
>> 91:      * <p>
>> 92:      * The returned NativeBuffer is guaranteed not to be asynchronously closeable.
> 
> This class, and the temporary buffer cache in sun.nio.ch.Util, are intended to be used with try-finally. There isn't any notion of  asynchronously close so maybe it would best to not add this comment to these sources.

That is clear to me but I am trying to prevent future redundant guarding. Anyway, I will remove the comments.

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PR: https://git.openjdk.org/jdk/pull/11260