This line will never be executed

https://github.com/honcheng/iOS-StyledPageControl/blob/91d5176cab4093c27d6e9a6b8a6a35788a33b987/StyledPageControlDemo/PageControlDemo/StyledPageControl.m#L197,L198

```objc
break;
total_width = self.numberOfPages*diameter + (self.numberOfPages-1)*gap; // will never be executed 
```

L197 will never be excuted