Proposed changes for 6656849

[Jean-Christophe Collet]

This is a serialization issue in Inet6Address. When de-serializing an 
address with an interface name as the scope, the test for its existence 
should be done sooner rather than later to avoid a NullPointerException.
I took the opportunity to clean up the code in Inet6Address to act on 
some NetBeans warning, in particular re-named a local variable that was 
masking a field.


See patch attached.

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