defer raises 'return value not checked'

[StyXman]

internal/cert/utils.go:72:16: Error return value of `cmd.Wait` is not checked (errcheck)
        defer cmd.Wait()
                      ^

I think this is a bug, since defer will check the error status. See https://golang.org/ref/spec#Defer_statements

If a deferred function value evaluates to nil, execution panics.

[c3d]

I interpret this spec the other way round:

If the deferred function has any return values, they are discarded when the function completes. (See also the section on handling panics.)