Fix logic.

Signed-off-by: Tom Wilkie <tom.wilkie@gmail.com>

cmd/logcli/main.go

@@ -50,7 +50,7 @@ func main() {
 
 func label() {
 	var path string
-	if labelName != nil {
+	if len(*labelName) > 0 {
 		path = fmt.Sprintf("/api/prom/label/%s/values", url.PathEscape(*labelName))
 	} else {
 		path = "/api/prom/label"

pkg/querier/http.go

@@ -108,7 +108,7 @@ func (q *Querier) QueryHandler(w http.ResponseWriter, r *http.Request) {
 func (q *Querier) LabelHandler(w http.ResponseWriter, r *http.Request) {
 	name, ok := mux.Vars(r)["name"]
 	req := &logproto.LabelRequest{
-		Values: !ok,
+		Values: ok,
 		Name:   name,
 	}
 	resp, err := q.Label(r.Context(), req)