Minor #3270 Followups

[TheBlueMatt]

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 86.66667% with 2 lines in your changes missing coverage. Please review.

Project coverage is 89.59%. Comparing base (bc1931b) to head (5c1440a). Report is 18 commits behind head on main.

Files with missing lines	Patch %	Lines
lightning-invoice/src/de.rs	50.00%	0 Missing and 1 partial :warning:
lightning-invoice/src/lib.rs	0.00%	0 Missing and 1 partial :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3349      +/-   ##
==========================================
- Coverage   89.62%   89.59%   -0.04%     
==========================================
  Files         127      127              
  Lines      103517   103519       +2     
  Branches   103517   103519       +2     
==========================================
- Hits        92780    92750      -30     
- Misses       8041     8062      +21     
- Partials     2696     2707      +11     

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