engine: resources: Remove named return params

Named return params aren't a favourite feature of mine, and they're
rarely used in the resource writing. They keep popping up because I once
used them and we've been copying and pasting code ever since. Get rid of
them all to help prevent the unnecessary spread.

engine/resources/print.go

@@ -82,7 +82,7 @@ func (obj *PrintRes) Watch() error {
 }
 
 // CheckApply method for Print resource. Does nothing, returns happy!
-func (obj *PrintRes) CheckApply(apply bool) (checkOK bool, err error) {
+func (obj *PrintRes) CheckApply(apply bool) (bool, error) {
 	obj.init.Logf("CheckApply: %t", apply)
 	if val, exists := obj.init.Recv()["Msg"]; exists && val.Changed {
 		// if we received on Msg, and it changed, log message