Enable more linters, and remove mal-functioned milestoned issue action.

Signed-off-by: Xun Jiang <blackpiglet@gmail.com>

pkg/itemoperationmap/backup_operation_map.go

@@ -72,10 +72,7 @@ func (m *BackupItemOperationsMap) DeleteOperationsForBackup(backupName string) {
 	// lock operations map
 	m.opsLock.Lock()
 	defer m.opsLock.Unlock()
-	if _, ok := m.opsMap[backupName]; ok {
-		delete(m.opsMap, backupName)
-	}
-	return
+	delete(m.opsMap, backupName)
 }
 
 // UploadProgressAndPutOperationsForBackup will upload the item operations for this backup to

pkg/itemoperationmap/restore_operation_map.go

@@ -72,10 +72,7 @@ func (m *RestoreItemOperationsMap) DeleteOperationsForRestore(restoreName string
 	// lock operations map
 	m.opsLock.Lock()
 	defer m.opsLock.Unlock()
-	if _, ok := m.opsMap[restoreName]; ok {
-		delete(m.opsMap, restoreName)
-	}
-	return
+	delete(m.opsMap, restoreName)
 }
 
 // UploadProgressAndPutOperationsForRestore will upload the item operations for this restore to