fix leak counter error when freeing a `NULL` mustache object #125

	name: Windows MingW CI

	on:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	jobs:
	build:

	runs-on: windows-latest
	timeout-minutes: 35

	steps:
	- uses: actions/checkout@v3
	- uses: egor-tensin/setup-mingw@v2
	with:
	platform: x64
	cc: 1
	- name: Test No-Op (debug)
	run: cc -O0 -fstack-protector-all tests\noop.c -I. -DFIO_LEAK_COUNTER=1 -DDEBUG -lws2_32 -o ./noop.exe && ./noop.exe
	- name: Test STL (debug) - no allocators
	run: cc -O0 -fstack-protector-all tests\stl.c -I. -DFIO_MEMORY_DISABLE=1 -DFIO_LEAK_COUNTER=1 -DDEBUG -lws2_32 -o ./stld.exe && ./stld.exe
	- name: Test fio_malloc speed
	run: cc -O2 -march=native tests\malloc.c -I. -lws2_32 -o ./malloc.exe && ./malloc.exe
	- name: Test STL
	run: cc -O2 -march=native tests\stl.c -DFIO_LEAK_COUNTER=1 -I. -lws2_32 -o ./stl.exe && ./stl.exe

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