Fix various nits. #2

demo/getting_started/interfaces.go

@@ -19,7 +19,6 @@ import (
 	"fmt"
 
 	oc "github.com/openconfig/ygot/demo/getting_started/pkg/ocdemo"
-	"github.com/openconfig/ygot/util"
 	"github.com/openconfig/ygot/ygot"
 )
 
@@ -116,12 +115,10 @@ func main() {
 	}
 	ygot.BuildEmptyTree(subif)
 	_, err = subif.Ipv4.NewAddress("Not a valid address")
-	if errs := invalidIf.Validate(); errs == nil {
-		panic(fmt.Sprintf("Did not find invalid address, got nil err: %v", errs))
+	if err := invalidIf.Validate(); err == nil {
+		panic(fmt.Sprintf("Did not find invalid address, got nil err: %v", err))
 	} else {
-		for _, e := range errs {
-			fmt.Printf("Got expected error: %v\n", e)
-		}
+		fmt.Printf("Got expected error: %v\n", err)
 	}
 
 	// We can also validate the device overall.
@@ -143,10 +140,10 @@ func main() {
 	}
 	fmt.Println(json)
 
-  // The generated code includes an Unmarshal function, which can be used to load
-  // a data tree such as the one that we just created.
-  loadd := &oc.Device{}
-  if err := oc.Unmarshal([]byte(json), loadd); err != nil {
-    panic(fmt.Sprintf("Can't unmarshal JSON: %v", err))
-  }
+	// The generated code includes an Unmarshal function, which can be used to load
+	// a data tree such as the one that we just created.
+	loadd := &oc.Device{}
+	if err := oc.Unmarshal([]byte(json), loadd); err != nil {
+		panic(fmt.Sprintf("Can't unmarshal JSON: %v", err))
+	}
 }