Fix ASAN error use-after-free in vtkSEPReader
The previous implementation os vtkSEPReader had a use-after-free. The function `vtkSEPReader::ReplaceFileName(..)` started with: ```c++ delete this->FileName; ``` And that means that the string pointed by `FileName` was destroyed. Even if the value of `FileName` was stored in the local variable `fileName`, in `vtkSEPReader::RequestData`, the string pointed by it was destroyed! The patch of this commit is a lot simpler: both the string pointed by `FileName` and the one that will replace it already exist in memory, and will not be modified during the run of `RequestData`. So we can just swap the pointers, without any need to memory allocation/deallocation to copy the strings.
Showing with 9 additions and 26 deletions