Fix warnings around errors

[abergmeier]

Use correct function and remove ending exclamation mark.

[hashicorp-cla]

All committers have signed the CLA.

[paddycarver]

Hey @abergmeier, does this fix a behavior or does something not work without this merged that works with it merged?

[abergmeier]

It fixes warning you get from Go. So reducing the noise when coding. Wonder though, why, I assume, your CI doesn't flag that.

[paddycarver]

Hmm, as far as I know, Go doesn't issue warnings. Do you mean golint? Or go vet? What command are you running that's producing the warning?

[abergmeier]

It is actually both. IIRC exclamation mark is golint, formatting function is go vet.

[ghost]

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