fix: correct getCallerClass() to return null instead of void

[brianheineman]

No description provided.

[github-actions]

Bencher Report

Branch	correct-get-caller-class
Testbed	localhost

⚠️ WARNING: No Threshold found!

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Benchmark	Latency	nanoseconds (ns)
from_bytes	📈 view plot ⚠️ NO THRESHOLD	26,601.00
load_hash_map	📈 view plot ⚠️ NO THRESHOLD	33,330.00
load_invalid_class	📈 view plot ⚠️ NO THRESHOLD	30,032.00
runtime_v11	📈 view plot ⚠️ NO THRESHOLD	34,617,000.00
runtime_v17	📈 view plot ⚠️ NO THRESHOLD	36,001,000.00
runtime_v21	📈 view plot ⚠️ NO THRESHOLD	36,100,000.00
runtime_v8	📈 view plot ⚠️ NO THRESHOLD	24,085,000.00
to_bytes	📈 view plot ⚠️ NO THRESHOLD	21,239.00
to_string	📈 view plot ⚠️ NO THRESHOLD	151,870.00
verify	📈 view plot ⚠️ NO THRESHOLD	1,013.30

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[codecov]

Codecov Report

Attention: Patch coverage is 4.34783% with 22 lines in your changes missing coverage. Please review.

Project coverage is 78.01%. Comparing base (f55dad7) to head (4169d44).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
..._vm/src/native_methods/jdk_internal_misc_unsafe.rs	7.14%	13 Missing ⚠️
...to_vm/src/native_methods/sun_reflect_reflection.rs	0.00%	9 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #159      +/-   ##
==========================================
- Coverage   78.01%   78.01%   -0.01%     
==========================================
  Files         526      526              
  Lines       44897    44900       +3     
==========================================
  Hits        35027    35027              
- Misses       9870     9873       +3     

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