dockerfile: remove unnecessary error wrappings

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

frontend/dockerfile/builder/build.go

@@ -425,7 +425,7 @@ func Build(ctx context.Context, c client.Client) (*client.Result, error) {
 				})
 
 				if err != nil {
-					return errors.Wrapf(err, "failed to create LLB definition")
+					return err
 				}
 
 				def, err := st.Marshal(ctx)

solver/llbsolver/bridge.go

@@ -126,7 +126,7 @@ func (b *llbBridge) Solve(ctx context.Context, req frontend.SolveRequest, sid st
 		}
 		res, err = f.Solve(ctx, b, req.FrontendOpt, req.FrontendInputs, sid, b.sm)
 		if err != nil {
-			return nil, errors.Wrapf(err, "failed to solve with frontend %s", req.Frontend)
+			return nil, err
 		}
 	} else {
 		return &frontend.Result{}, nil