[PATCH] erofs: fold in used-once helper erofs_workgroup_unfreeze_final()

[Chao Yu]

On 2020/7/30 2:02, Gao Xiang wrote:
> It's expected that erofs_workgroup_unfreeze_final() won't
> be used in other places. Let's fold it to simplify the code.
> 
> Signed-off-by: Gao Xiang <hsiangkao at redhat.com>

Reviewed-by: Chao Yu <yuchao0 at huawei.com>

Thanks,