[Libguestfs] [PATCH libnbd v2 0/5] lib: Implement closure lifetimes.

[Richard W.M. Jones]

v1 was here:
https://www.redhat.com/archives/libguestfs/2019-July/thread.html#00231

The changes address everything that Eric picked up in his review of
the first two patches.  I have also added two more patches (4 and 5)
which respectively fix docs and change int status -> unsigned status,
as discussed.

Passes make, check, check-valgrind.

Rich.