fix(hypercall): uniform error reporting on invalid hypercalls

[fogti]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 76.03%. Comparing base (b4e2b0b) to head (af0418a).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/hypercall.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1160      +/-   ##
==========================================
- Coverage   76.36%   76.03%   -0.34%     
==========================================
  Files          29       29              
  Lines        3613     3613              
==========================================
- Hits         2759     2747      -12     
- Misses        854      866      +12     

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[jounathaen]

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