[PGPRO-5360] Fix for freeze (Valgrind and compilation with -Og option)

[kovdb75]

Sometimes pg_patman is freezes for 1 min (in case it started unde Valgrind and complied with -Og option).
This change (for variable failures_count) fixes it.

[codecov]

Codecov Report

Merging #251 (66da266) into master (afddc65) will increase coverage by 0.42%.
The diff coverage is 100.00%.

❗ Current head 66da266 differs from pull request most recent head f135090. Consider uploading reports for the commit f135090 to get more accurate results

@@            Coverage Diff             @@
##           master     #251      +/-   ##
==========================================
+ Coverage   91.46%   91.89%   +0.42%     
==========================================
  Files          43       33      -10     
  Lines        7266     6562     -704     
==========================================
- Hits         6646     6030     -616     
+ Misses        620      532      -88     

Impacted Files	Coverage Δ
src/pathman_workers.c	84.94% <100.00%> (+0.91%)	⬆️
src/pg_pathman.c	93.40% <0.00%> (-1.79%)	⬇️
src/planner_tree_modification.c	86.96% <0.00%> (-1.56%)	⬇️
src/include/compat/pg_compat.h	92.30% <0.00%> (-1.03%)	⬇️
src/utils.c	92.10% <0.00%> (-0.66%)	⬇️
src/init.c	91.02% <0.00%> (-0.30%)	⬇️
src/compat/pg_compat.c	74.41% <0.00%> (-0.20%)	⬇️
src/runtime_merge_append.c	69.51% <0.00%> (-0.18%)	⬇️
src/xact_handling.c	90.74% <0.00%> (-0.17%)	⬇️
src/partition_filter.c	96.44% <0.00%> (-0.14%)	⬇️
... and 25 more

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