Merge pull request #569 from hermeznetwork/fix/node-redundant-condition

node: remove redundant error check

node/node.go

@@ -246,9 +246,6 @@ func NewNode(mode Mode, cfg *config.Node) (*Node, error) {
 		if err != nil {
 			return nil, tracerr.Wrap(err)
 		}
-		if err != nil {
-			return nil, tracerr.Wrap(err)
-		}
 		serverProofs := make([]prover.Client, len(cfg.Coordinator.ServerProofs))
 		for i, serverProofCfg := range cfg.Coordinator.ServerProofs {
 			serverProofs[i] = prover.NewProofServerClient(serverProofCfg.URL,