builder/vmware: Style nitpick

/cc @smerrill: I prefer to do state changes at the end. :)

builder/vmware/step_create_disk.go

@@ -15,7 +15,7 @@ import (
 //   ui     packer.Ui
 //
 // Produces:
-//   <nothing>
+//   full_disk_path (string) - The full path to the created disk.
 type stepCreateDisk struct{}
 
 func (stepCreateDisk) Run(state map[string]interface{}) multistep.StepAction {
@@ -25,7 +25,6 @@ func (stepCreateDisk) Run(state map[string]interface{}) multistep.StepAction {
 
 	ui.Say("Creating virtual machine disk")
 	full_disk_path := filepath.Join(config.OutputDir, config.DiskName+".vmdk")
-	state["full_disk_path"] = full_disk_path
 	if err := driver.CreateDisk(full_disk_path, fmt.Sprintf("%dM", config.DiskSize)); err != nil {
 		err := fmt.Errorf("Error creating disk: %s", err)
 		state["error"] = err
@@ -33,6 +32,8 @@ func (stepCreateDisk) Run(state map[string]interface{}) multistep.StepAction {
 		return multistep.ActionHalt
 	}
 
+	state["full_disk_path"] = full_disk_path
+
 	return multistep.ActionContinue
 }