RFR(XS): 8166584: Remove obsolete utility function NET_ThrowSocketException in windows libnet

[Langer, Christoph]

Hi,

while looking at utility functions for creating exceptions in libjava/libnet I found a small spot that should be consolidated right away.

The function NET_ThrowSocketException does only exist in the windows native implementation and is only used in 3 places in SocketInputStream.c. I removed this in favor of directly calling JNU_ThrowByName as the Unix variant of that code already does.

In that function Java_java_net_SocketInputStream_socketRead0 I also replaced throwing a SocketException with throwing an NPE in the rare case that a the JNI input for the file descriptor is null. That's probably more natural and should virtually never occur anyways.

Bug: https://bugs.openjdk.java.net/browse/JDK-8166584
Webrev: http://cr.openjdk.java.net/~clanger/webrevs/8166584.0/

Thanks in advance for reviewing :)

Best regards
Christoph

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