net: fix typo causing the wrong receive buffer size
net: fix typo causing the wrong receive buffer size

Surprisingly this hasn't been causing me any issues while testing, probably
because it requires lots of large blocks to be flying around.

Send/Recv corks need tests!

bitcoinxt/bitcoinxt,bitcoinxt/bitcoinxt,dagurval/bitcoinxt,dagurval/bitcoinxt,dagurval/bitcoinxt,bitcoinxt/bitcoinxt,bitcoinxt/bitcoinxt,dagurval/bitcoinxt,bitcoinxt/bitcoinxt,bitcoinxt/bitcoinxt,dagurval/bitcoinxt,dagurval/bitcoinxt