Fix build warnings

[jkczyz]

No description provided.

[codecov]

Codecov Report

Merging #821 (8ce7281) into main (4894d52) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #821      +/-   ##
==========================================
- Coverage   90.97%   90.95%   -0.02%     
==========================================
  Files          48       48              
  Lines       26452    26452              
==========================================
- Hits        24064    24059       -5     
- Misses       2388     2393       +5     

Impacted Files	Coverage Δ
lightning/src/routing/router.rs	96.86% <100.00%> (ø)
lightning/src/ln/functional_tests.rs	96.91% <0.00%> (-0.09%)	⬇️

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