Datagram socket leak

[Alan Bateman]

Michael McMahon wrote:
> Yes, the regression tests picked that up as well. Well spotted.
>
> http://cr.openjdk.java.net/~michaelm/7085981/webrev.5/
DatagramSocket looks okay to me. An alternative might be:

try {
    :
} catch (SocketException | IllegalArgumentException | SecurityException e) {
    close();
    throw e;
}

As Socket.close can throw an IOException then maybe you could use the 
suppressed exception feature, ie:

try {
    :
} catch (SocketException | IllegalArgumentException | SecurityException e) {
    try {
        close();
    } catch (IOException ce) {
        e.addSuppressed(ce);
    }
    throw e;
}

In passing, I notice in Socket L423 that it checks if address is null 
but at L416 it throws NPE if null.

-Alan.