[SanitizerLayer] Fix resource leaks in "san_utils.cpp"

[AllanZyne]

This resolves coverity issues:

Resource leaks (RESOURCE_LEAK)
Variable "handle" going out of scope leaks the storage it points to.

Incorrect expression (BAD_COMPARE)
This implicit conversion to a function pointer is suspicious: "__asan_init != NULL".

[codecov-commenter]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (cd97e17) 15.39% compared to head (e4b5b89) 15.39%.

Files	Patch %	Lines
source/loader/layers/sanitizer/linux/san_utils.cpp	16.66%	5 Missing ⚠️

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Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1312   +/-   ##
=======================================
  Coverage   15.39%   15.39%           
=======================================
  Files         240      240           
  Lines       34122    34122           
  Branches     3779     3779           
=======================================
+ Hits         5252     5254    +2     
+ Misses      28819    28818    -1     
+ Partials       51       50    -1     

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