cmd/objbench: fix the objbench command run on Windows

cmd/objbench.go

@@ -25,6 +25,7 @@ import (
 	"os"
 	"os/user"
 	"path/filepath"
+	"runtime"
 	"sort"
 	"strconv"
 	"strings"
@@ -167,17 +168,18 @@ func objbench(ctx *cli.Context) error {
 		pass = fmt.Sprintf("%s%dm%s%s", COLOR_SEQ, GREEN, pass, RESET_SEQ)
 		failed = fmt.Sprintf("%s%dm%s%s", COLOR_SEQ, RED, failed, RESET_SEQ)
 	}
-	nobody, err := user.Lookup("nobody")
-	if err != nil {
-		logger.Fatalf("lookup nobody user failed: %v", err)
-	} else {
-		group, err := user.LookupGroupId(nobody.Gid)
+	if runtime.GOOS != "windows" {
+		nobody, err := user.Lookup("nobody")
 		if err != nil {
-			logger.Fatalf("lookup nobody's group failed: %v", err)
+			logger.Fatalf("lookup nobody user failed: %v", err)
+		} else {
+			group, err := user.LookupGroupId(nobody.Gid)
+			if err != nil {
+				logger.Fatalf("lookup nobody's group failed: %v", err)
+			}
+			groupName = group.Name
 		}
-		groupName = group.Name
 	}
-
 	if ctx.Bool("skip-functional-tests") {
 		if err := blob.Create(); err != nil {
 			return fmt.Errorf("can't create bucket: %s", err)
@@ -650,6 +652,7 @@ func functionalTesting(blob object.ObjectStorage, result *[][]string, colorful b
 		if err != nil {
 			return "", err
 		}
+		defer r.Close()
 		data, err := io.ReadAll(r)
 		if err != nil {
 			return "", err