fix: file is always null when using a server via tcp

[Gamewalker]

fix: file is always null when a file is turned into a stream and then sent to a server

[renchey]

I still had issues with this, but it pointed me in the right direction!

The following worked for me as I was using a callback

return hasCb ? cb(null, file, {...isInfected, file}, []) : resolve({ ...isInfected, file});

[kylefarris]

Looks great! Thanks! (And sorry for the delay)