improve show_node_id (#1433)

* fix show_node_id

* make LoadNodeKey public

* make LoadNodeKey public

* remove if

* remove if

cmd/tendermint/commands/show_node_id.go

@@ -6,6 +6,7 @@ import (
 	"github.com/spf13/cobra"
 
 	"github.com/tendermint/tendermint/p2p"
+
 )
 
 // ShowNodeIDCmd dumps node's ID to the standard output.
@@ -16,10 +17,12 @@ var ShowNodeIDCmd = &cobra.Command{
 }
 
 func showNodeID(cmd *cobra.Command, args []string) error {
-	nodeKey, err := p2p.LoadOrGenNodeKey(config.NodeKeyFile())
+
+	nodeKey, err := p2p.LoadNodeKey(config.NodeKeyFile())
 	if err != nil {
 		return err
 	}
 	fmt.Println(nodeKey.ID())
+
 	return nil
 }