[Libguestfs] [PATCH libnbd] lib: Kill subprocess in nbd_close.

[Richard W.M. Jones]

This is a simple patch which stops nbd_close from waiting too long for
a server subprocess to shut down.

I wanted to send SIGHUP because the server will be able to catch it
and do a clean shutdown if that is required.  Is another signal
better?

Is it right to send a signal here?

Rich.