spelling correct

SimklUserFunctions.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	"encoding/json"
+	"errors"
 	"fmt"
 	"io"
 	"log"
@@ -114,7 +115,7 @@ func (a *App) handleSimklCallback(wg *sync.WaitGroup) {
 
 	go func() {
 		defer wg.Done()
-		if err := srv.ListenAndServe(); err != nil && err != http.ErrServerClosed {
+		if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
 			log.Fatalf("listen: %s\n", err)
 		}
 		fmt.Println("Shutting down...")
@@ -147,8 +148,8 @@ func getSimklAuthorizationToken(content string) SimklJWT {
 	response.Header.Add("Content-Type", "application/json")
 
 	client := &http.Client{}
-	res, reserr := client.Do(response)
-	if reserr != nil {
+	res, resErr := client.Do(response)
+	if resErr != nil {
 		log.Printf("Failed at res, %s\n", err)
 	}