Command handlers shouldn't send replies themselves, but just prepare the
message and let vu_dispatch() send it. Otherwise, vu_dispatch() will add
a second reply as an ACK when NEED_REPLY was requested.

QEMU's vhost-user devices are not affected by these bugs because they
don't set NEED_REPLY for the commands that get it wrong. libblkio does
run into it, though.

Kevin Wolf (3):
  docs/vhost-user: Fix mismerge
  libvhost-user: Fix VHOST_USER_GET_MAX_MEM_SLOTS reply
  libvhost-user: Fix VHOST_USER_ADD_MEM_REG reply

 docs/interop/vhost-user.rst               | 16 ----------------
 subprojects/libvhost-user/libvhost-user.c | 19 +++----------------
 2 files changed, 3 insertions(+), 32 deletions(-)

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2.35.3