The total number of chunks was not computed properly

[joselotl]

When the data lenght is smaller than n_process*chunk_size, the last process was not computing properly the chunk_size.

Problem & Solution Description (including issue #)

Code Quality

• [ ] My code follows the code style of this project
• [ ] I have written unit tests or justified all instances of #pragma: no cover; in the case of a bugfix, a new test that breaks as a result of the bug has been added
• [ ] My code contains relevant comments and necessary documentation for future maintainers; the change is reflected in applicable demos/tutorials (with output cleared!) and added/updated docstrings use the NumPy docstring format
• [ ] Any breaking changes, described above, are accompanied by backwards compatibility and deprecation warnings

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 95.81%. Comparing base (85ff7c8) to head (71a70a2). Report is 2 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #23 +/- ## ======================================= Coverage 95.81% 95.81% ======================================= Files 4 4 Lines 287 287 ======================================= Hits 275 275 Misses 12 12 ```

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