hg: jdk9/dev/jdk: 8074821: Resolve disabled warnings for libnio

[brian.burkhalter at oracle.com]

Changeset: fb9b6e2d3b5a
Author:    bpb
Date:      2015-08-19 13:11 -0700
URL:       http://hg.openjdk.java.net/jdk9/dev/jdk/rev/fb9b6e2d3b5a

8074821: Resolve disabled warnings for libnio
Summary: Enable the indicated warnings and correct the code which provoked them.
Reviewed-by: alanb

! make/lib/NioLibraries.gmk
! src/java.base/share/classes/sun/nio/ch/Net.java
! src/java.base/unix/native/libnio/ch/IOUtil.c
! src/java.base/windows/native/libnio/ch/Iocp.c
! src/java.base/windows/native/libnio/ch/Net.c