Update ttrpc to 92c8520ef9f86600c650dd540266a00

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

vendor/github.com/containerd/ttrpc/client.go

@@ -29,6 +29,7 @@ import (
 	"github.com/gogo/protobuf/proto"
 	"github.com/pkg/errors"
 	"github.com/sirupsen/logrus"
+	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 )
 
@@ -134,10 +135,9 @@ func (c *Client) Call(ctx context.Context, service, method string, req, resp int
 		return err
 	}
 
-	if cresp.Status != nil {
+	if cresp.Status != nil && cresp.Status.Code != int32(codes.OK) {
 		return status.ErrorProto(cresp.Status)
 	}
-
 	return nil
 }