Fix sched_{get,set}affinity bug

[stevenengler]

Closes #2625.

[codecov]

Codecov Report

Base: 68.06% // Head: 67.79% // Decreases project coverage by -0.27% ⚠️

Coverage data is based on head (09da904) compared to base (49c64ee).
Patch coverage: 75.75% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2657      +/-   ##
==========================================
- Coverage   68.06%   67.79%   -0.28%     
==========================================
  Files         202      202              
  Lines       30100    30112      +12     
  Branches     5855     5856       +1     
==========================================
- Hits        20489    20415      -74     
- Misses       4976     5074      +98     
+ Partials     4635     4623      -12     

Flag	Coverage Δ
tests	67.79% <75.75%> (-0.28%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/main/host/syscall/handler/sched.rs	41.79% <0.00%> (-2.99%)	⬇️
src/main/host/process.rs	83.48% <90.90%> (+0.19%)	⬆️
src/main/host/host.rs	78.01% <91.66%> (+0.41%)	⬆️
src/main/host/thread.rs	79.02% <100.00%> (+0.44%)	⬆️
src/main/host/syscall/handler/eventfd.rs	0.00% <0.00%> (-72.23%)	⬇️
src/main/host/descriptor/eventfd.rs	8.08% <0.00%> (-56.57%)	⬇️
src/main/core/logger/shadow_logger.rs	69.61% <0.00%> (-2.77%)	⬇️
src/main/host/syscall/type_formatting.rs	75.00% <0.00%> (-2.59%)	⬇️
src/main/utility/shm_cleanup.rs	59.09% <0.00%> (-2.28%)	⬇️
... and 10 more

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