RFR(XS): 8166604: nio: remove unneeded locals variables and correct NPE

[Langer, Christoph]

Hi,

please review a small cleanup in nio socket and datagram channel that I have spotted.

I would even suggest to completely remove the null check throwing NPE in DatagramChannelImpl.receive(ByteBuffer dst) as an NPE would implicitly be thrown when dst is null and dst.isReadOnly() is called. The current behavior would not change then.

Webrev: http://cr.openjdk.java.net/~clanger/webrevs/8166604.0/
Bug: https://bugs.openjdk.java.net/browse/JDK-8166604

Best regards
Christoph

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