qemu-file: remove shutdown member

The first thing that we do after setting the shutdown value is set the
error as -EIO if there is not a previous error.

So this value is redundant.  Just remove it and use
qemu_file_get_error() in the places that it was tested.

Signed-off-by: Juan Quintela <quintela@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Message-Id: <20230504113841.23130-7-quintela@redhat.com>
1 file changed