Audit memory safety of C code in workflow-windows

[sboosali]

https://github.com/sboosali/workflow/blob/master/workflow-windows/native/Workflow.c

https://github.com/sboosali/workflow/blob/master/workflow-windows/sources/Workflow/Windows/Foreign.hs

getByReference https://github.com/sboosali/workflow/blob/master/workflow-windows/sources/Workflow/Windows/Bindings.hs#L402

(It doesn't segfault or anything, but I don't know much C beyond riding bindings)