Unchecked Inline error in packetmachine_controller.go

[cprivitere]

https://github.com/kubernetes-sigs/cluster-api-provider-packet/blob/e9c2ee01764ec66a6209cb9bf76bbfcdc83017ca/controllers/packetmachine_controller.go#L313

This error check isn't checking the actual variable that has the error info in it. The "err" in the line should be changed to "patchErr"

(Found while testing the .golancci.yaml from upstream, so I'll be adding an issue to update our .golangci.yaml...)