Potential Memory Leak in mmk_stub_create_static Function

[RiversJin]

Hey there,

I think I've found a memory leak in mmk_stub_create_static. It looks like name isn't getting freed when the function returns an "ENOENT" error.

This isn't a big deal for a test framework since tests don't run for long, but it does trigger a leak report when using tools like Address Sanitizer.

I think it's an easy fix and I'd like to submit a PR if that's okay with you.

Thanks!

RiversJin