Reduce the overhead from malloc usable

[sundb]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 77.77778% with 4 lines in your changes missing coverage. Please review.

Project coverage is 68.99%. Comparing base (27dd3b7) to head (a6dce44).

Files with missing lines	Patch %	Lines
src/zmalloc.c	77.77%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##           unstable     #384      +/-   ##
============================================
+ Coverage     68.98%   68.99%   +0.01%     
============================================
  Files           126      126              
  Lines         72609    72607       -2     
============================================
+ Hits          50087    50095       +8     
+ Misses        22522    22512      -10     

Files with missing lines	Coverage Δ
src/zmalloc.c	83.28% <77.77%> (-0.40%)	⬇️

... and 23 files with indirect coverage changes

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