fs: Fix setting new deployment ID in format when not present (#8517)

The code does not properly set a new deployemnt ID when not present
in format.json: it loops twice without releasing write lock on format.json
causing an infinite locking error on the same file.

This commit fixes and simplifies a little the code.

cmd/format-fs.go

@@ -350,27 +350,24 @@ func formatFSFixDeploymentID(fsFormatPath string) error {
 			logger.Info("Another minio process(es) might be holding a lock to the file %s. Please kill that minio process(es) (elapsed %s)\n", fsFormatPath, getElapsedTime())
 			continue
 		}
-		if err != nil {
 		break
 	}
+	if err != nil {
+		return err
+	}
+
+	defer wlk.Close()
 
 	if err = jsonLoad(wlk, format); err != nil {
-			break
+		return err
 	}
 
 	// Check if format needs to be updated
 	if format.ID != "" {
-			err = nil
-			break
+		return nil
 	}
 
+	// Set new UUID to the format and save it
 	format.ID = mustGetUUID()
-		if err = jsonSave(wlk, format); err != nil {
-			break
-		}
-	}
-	if wlk != nil {
-		wlk.Close()
-	}
-	return err
+	return jsonSave(wlk, format)
 }