golangci-lint: enable nilerr linter

cli/command/idresolver/idresolver.go:33:4: error is not nil (line 31) but it returns nil (nilerr)
    			return id, nil
    			^
    cli/command/idresolver/idresolver.go:45:4: error is not nil (line 43) but it returns nil (nilerr)
    			return id, nil
    			^

Signed-off-by: Sebastiaan van Stijn <github@gone.nl>

.golangci.yml

@@ -15,6 +15,7 @@ linters:
     - megacheck
     - misspell
     - nakedret
+    - nilerr        # Detects code that returns nil even if it checks that the error is not nil.
     - predeclared
     - revive
     - staticcheck

cli/command/idresolver/idresolver.go

@@ -30,7 +30,8 @@ func (r *IDResolver) get(ctx context.Context, t interface{}, id string) (string,
 	case swarm.Node:
 		node, _, err := r.client.NodeInspectWithRaw(ctx, id)
 		if err != nil {
-			return id, nil
+			// TODO(thaJeztah): should error-handling be more specific, or is it ok to ignore any error?
+			return id, nil //nolint:nilerr // ignore nil-error being returned, as this is a best-effort.
 		}
 		if node.Spec.Annotations.Name != "" {
 			return node.Spec.Annotations.Name, nil
@@ -42,7 +43,8 @@ func (r *IDResolver) get(ctx context.Context, t interface{}, id string) (string,
 	case swarm.Service:
 		service, _, err := r.client.ServiceInspectWithRaw(ctx, id, types.ServiceInspectOptions{})
 		if err != nil {
-			return id, nil
+			// TODO(thaJeztah): should error-handling be more specific, or is it ok to ignore any error?
+			return id, nil //nolint:nilerr // ignore nil-error being returned, as this is a best-effort.
 		}
 		return service.Spec.Annotations.Name, nil
 	default: