Fix UB in pred_max test

[redzic]

Fixes #3029

[codecov-commenter]

Codecov Report

Base: 86.44% // Head: 86.45% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (14451f7) compared to base (bc8da6f).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3030   +/-   ##
=======================================
  Coverage   86.44%   86.45%           
=======================================
  Files          89       89           
  Lines       34094    34094           
=======================================
+ Hits        29474    29475    +1     
+ Misses       4620     4619    -1     

Impacted Files	Coverage Δ
src/predict.rs	81.56% <100.00%> (ø)
src/rdo.rs	85.24% <0.00%> (-0.37%)	⬇️
v_frame/src/plane.rs	88.78% <0.00%> (-0.23%)	⬇️
src/deblock.rs	94.90% <0.00%> (-0.08%)	⬇️
src/cpu_features/x86.rs	39.58% <0.00%> (ø)
src/encoder.rs	87.13% <0.00%> (+0.06%)	⬆️
src/header.rs	69.06% <0.00%> (+0.12%)	⬆️
src/api/internal.rs	97.69% <0.00%> (+0.23%)	⬆️
src/context/partition_unit.rs	89.72% <0.00%> (+0.55%)	⬆️
src/context/transform_unit.rs	90.49% <0.00%> (+0.71%)	⬆️
... and 1 more

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