Remove redundant nil check

[computerphilosopher]

'make' command fails because of 'golangci-lint'

collector/cpu_linux.go:145:2: if-return: redundant if ...; err != nil check, just return error instead. (revive)
        if err := c.updateThermalThrottle(ch); err != nil {
                return err
        }
collector/drm_linux.go:102:2: if-return: redundant if ...; err != nil check, just return error instead. (revive)
        if err := c.updateAMDCards(ch); err != nil {
                return err
        }

[discordianfish]

Makes sense, thanks!

[discordianfish]

You need to sign-off your commits though (git commit --amend -s). See DCO check.

[computerphilosopher]

@discordianfish

I signed-off my commits. Thanks for the review.