Fix numerous lint issues

Signed-off-by: Shengqi Chen <harry-chen@outlook.com>

worker/cgroup_test.go

@@ -14,7 +14,7 @@ import (
 	cgv1 "github.com/containerd/cgroups/v3/cgroup1"
 	cgv2 "github.com/containerd/cgroups/v3/cgroup2"
 	units "github.com/docker/go-units"
-	"github.com/moby/moby/pkg/reexec"
+	"github.com/moby/sys/reexec"
 
 	. "github.com/smartystreets/goconvey/convey"
 )
@@ -250,7 +250,7 @@ sleep 30
 				if cgcf.Group == "" {
 					wkrg, err := cgv2.NestedGroupPath("")
 					So(err, ShouldBeNil)
-					wkrMgr, err := cgv2.Load(wkrg)
+					wkrMgr, _ := cgv2.Load(wkrg)
 					allCtrls, err := wkrMgr.Controllers()
 					So(err, ShouldBeNil)
 					err = wkrMgr.ToggleControllers(allCtrls, cgv2.Disable)