the libc free() (man 3 free) allows free'ing NULL pointers. I think the quality
of the codebase is improved if we stick to this standard.
Your suggestion is excellent. We definitely have to remove all `if (buf)` tests!
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Shouldn't you fix the caller that pkg_free's without checking for NULL instead?
If you "allow" it, then you might as well drop all the `if(buf)` before every
`pkg_free(buf)`. Allowing both makes the code inconsistent.
Right?
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