Fix heap corruption after apache reloads (appsec)

[cataphract]

Description

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 72.38%. Comparing base (1b40137) to head (adf82ce).
Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
appsec/src/extension/ddtrace.c	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #2928      +/-   ##
============================================
- Coverage     72.39%   72.38%   -0.01%     
  Complexity     2526     2526              
============================================
  Files           135      135              
  Lines         14400    14400              
  Branches        989      989              
============================================
- Hits          10425    10424       -1     
  Misses         3433     3433              
- Partials        542      543       +1     

Flag	Coverage Δ
appsec-extension	68.34% <0.00%> (-0.03%)	⬇️
tracer-php	73.96% <ø> (ø)

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Files with missing lines	Coverage Δ
appsec/src/extension/ddtrace.c	59.55% <0.00%> (-0.45%)	⬇️

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