server: Rely on nbdkit_add_extent errno
commitb2c32710859a45516d3e92ce636b489d33de170a
authorEric Blake <eblake@redhat.com>
Fri, 30 Aug 2019 18:38:03 +0000 (30 13:38 -0500)
committerEric Blake <eblake@redhat.com>
Fri, 30 Aug 2019 18:38:03 +0000 (30 13:38 -0500)
treee5baa738593918a406a155393d5e5a4aae1095dd
parente5020691f2a60d7ae60b61713c36ec11fe37fd43
server: Rely on nbdkit_add_extent errno

At the time commit 26455d45 added a fallback for .extents,
nbdkit_add_extent() didn't always set errno.  But that was later fixed
in cec77449, so we can simplify our code.

Signed-off-by: Eric Blake <eblake@redhat.com>
server/protocol.c