bitcoin.lua getaddr fails with error

[Mark Scrano <mscrano () ieee org>]

Hey guys,
The nmap bitcoin-getaddr script is failing on the latest version of bitcoin
core.  After running the script with debug enabled an error occurs in the
bitcoin.lua script in the libraries.

NSE: bitcoin-getaddr against XX.XX.XX.XX:8333 threw an error!
/usr/local/bin/../share/nmap/nselib/bitcoin.lua:246: attempt to concatenate
local 'p_length' (a nil value)
stack traceback:
    /usr/local/bin/../share/nmap/nselib/bitcoin.lua:246: in function 'parse'
    /usr/local/bin/../share/nmap/nselib/bitcoin.lua:234: in function 'new'
    /usr/local/bin/../share/nmap/nselib/bitcoin.lua:414: in function
</usr/local/bin/../share/nmap/nselib/bitcoin.lua:403>
    (...tail calls...)
    /usr/local/bin/../share/nmap/nselib/bitcoin.lua:529: in function
'getNodes'
    /usr/local/bin/../share/nmap/scripts/bitcoin-getaddr.nse:55: in
function </usr/local/bin/../share/nmap/scripts/bitcoin-getaddr.nse:41>
    (...tail calls...)

> From what I can tell this may be an issue relating to bitcoin core versions
greater than 9 but I'm unsure.  Any advice you can provide would be
appreciated.
Thanks
Mark Scrano

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