misc: Miscellaneous corner cases fixes

[mloubout]

Corner cases triggered in pro by fft

[EdCaunt]

All seems reasonable. Typo in PR name "miscelanous" -> "miscellaneous"

[codecov]

Codecov Report

❌ Patch coverage is 69.91870% with 37 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.72%. Comparing base (0d90d06) to head (fc4ea00).
⚠️ Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
devito/passes/iet/languages/CXX.py	36.00%	15 Missing and 1 partial ⚠️
tests/test_dtypes.py	73.17%	8 Missing and 3 partials ⚠️
devito/passes/iet/languages/C.py	72.72%	5 Missing and 1 partial ⚠️
devito/mpi/routines.py	0.00%	2 Missing ⚠️
devito/arch/archinfo.py	0.00%	1 Missing ⚠️
devito/passes/iet/parpragma.py	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2730      +/-   ##
==========================================
- Coverage   82.94%   78.72%   -4.22%     
==========================================
  Files         248      248              
  Lines       50022    50154     +132     
  Branches     4402     4422      +20     
==========================================
- Hits        41492    39486    -2006     
- Misses       7776     9857    +2081     
- Partials      754      811      +57     

Flag	Coverage Δ
pytest-gpu-aomp-amdgpuX	?
pytest-gpu-nvc-nvidiaX	?

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