compile error C4703: potentially uninitialized local pointer variable 'input' used

[icanhasmath]

Describe the bug
When I compile libyaml 0.2.5 on MSVC 2022, with /sdl for added security I get an error:
error C4703: potentially uninitialized local pointer variable 'input' used for:

* libyaml-0.2.5\_build\tests\run-parser-test-suite.vcxproj
* libyaml-0.2.5\_build\tests\run-parser.vcxproj