criu: return error when checking for min version

[Luap99]

There is weird issue #18856 which causes the version check to fail. Return the underlying error in these cases so we can see it and debug it.

Does this PR introduce a user-facing change?

None

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[Luap99]

@edsantiago PTAL

[edsantiago]

I like the idea of handling errors, of course, but still hate the "CRIU is too old and I'm not going to tell you what version you have installed nyah nyah". Is there any way to rework the logic so the too-old message code does the comparison and can therefore display the current version?

[Luap99]

Sounds good, I think I can only return an error from this function then the caller just needs to do if err != nil and then inside this function I can create a proper error with the full context.

[edsantiago]

Nice, thank you! LGTM.

[rhatdan]

/lgtm