[PATCH] nbd/server: Suppress Broken pipe errors on abrupt disconnection

[Richard W.M. Jones]

This simple patch suppresses a warning message from qemu-nbd when a
client abruptly disconnects.  There is a way to work around this in
the client (by shutting down the connection properly).  Nevertheless
the "Broken pipe" error seems unnecessary to me as it does not convey
any useful information and might be used to fill up logs.

Rich.