Guard against having NetworkInterface.getNetworkInterfaces() return null
Guard against having NetworkInterface.getNetworkInterfaces() return null

Motivation:

NetworkInterface.getNetworkInterfaces() may return null if no network interfaces are found. We should guard against it.

Modifications:

Check for null return value.

Result:

Fixes [#6384]

imangry/netty-zh,imangry/netty-zh,chanakaudaya/netty,yipen9/netty,chanakaudaya/netty,imangry/netty-zh,chanakaudaya/netty,yipen9/netty,yipen9/netty,imangry/netty-zh,chanakaudaya/netty,chanakaudaya/netty,imangry/netty-zh,yipen9/netty