Return error if forcestop is not used

This is again missed during 02a30b and this patch will be fixing the
fact that we'd always error out when forced shutdown was triggered,
even if it was successful.

pkg/crc/machine/generate_bundle.go

@@ -37,8 +37,9 @@ func (client *client) GenerateBundle(forceStop bool) error {
 			if err := client.PowerOff(); err != nil {
 				return err
 			}
+		} else {
+			return err
 		}
-		return err
 	}
 	running, err := client.IsRunning()
 	if err != nil {