Fix stack overflow in descend_code_typed

[fredrikekre]

Fixes a typo introduced in ac0a428.

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 0.00%. Comparing base (2c33b9a) to head (daf8abd).
⚠️ Report is 80 commits behind head on master.

Files with missing lines	Patch %	Lines
src/Cthulhu.jl	0.00%	1 Missing ⚠️

Additional details and impacted files

@@          Coverage Diff           @@
##           master    #671   +/-   ##
======================================
  Coverage    0.00%   0.00%           
======================================
  Files           9      12    +3     
  Lines        1556    1600   +44     
======================================
- Misses       1556    1600   +44     

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[aviatesk]

Thanks!