Add more linters to improve code readability (#19989)

Add nakedret, unconvert, wastedassign, stylecheck and nolintlint linters to improve code readability

- nakedret - https://github.com/alexkohler/nakedret - nakedret is a Go static analysis tool to find naked returns in functions greater than a specified function length.
- unconvert - https://github.com/mdempsky/unconvert - Remove unnecessary type conversions
- wastedassign - https://github.com/sanposhiho/wastedassign -  wastedassign finds wasted assignment statements.
- notlintlint -  Reports ill-formed or insufficient nolint directives
- stylecheck - https://staticcheck.io/docs/checks/#ST - keep style consistent
  - excluded: [ST1003 - Poorly chosen identifier](https://staticcheck.io/docs/checks/#ST1003) and [ST1005 - Incorrectly formatted error string](https://staticcheck.io/docs/checks/#ST1005)

modules/storage/storage.go

@@ -169,35 +169,35 @@ func NewStorage(typStr string, cfg interface{}) (ObjectStorage, error) {
 func initAvatars() (err error) {
 	log.Info("Initialising Avatar storage with type: %s", setting.Avatar.Storage.Type)
 	Avatars, err = NewStorage(setting.Avatar.Storage.Type, &setting.Avatar.Storage)
-	return
+	return err
 }
 
 func initAttachments() (err error) {
 	log.Info("Initialising Attachment storage with type: %s", setting.Attachment.Storage.Type)
 	Attachments, err = NewStorage(setting.Attachment.Storage.Type, &setting.Attachment.Storage)
-	return
+	return err
 }
 
 func initLFS() (err error) {
 	log.Info("Initialising LFS storage with type: %s", setting.LFS.Storage.Type)
 	LFS, err = NewStorage(setting.LFS.Storage.Type, &setting.LFS.Storage)
-	return
+	return err
 }
 
 func initRepoAvatars() (err error) {
 	log.Info("Initialising Repository Avatar storage with type: %s", setting.RepoAvatar.Storage.Type)
 	RepoAvatars, err = NewStorage(setting.RepoAvatar.Storage.Type, &setting.RepoAvatar.Storage)
-	return
+	return err
 }
 
 func initRepoArchives() (err error) {
 	log.Info("Initialising Repository Archive storage with type: %s", setting.RepoArchive.Storage.Type)
 	RepoArchives, err = NewStorage(setting.RepoArchive.Storage.Type, &setting.RepoArchive.Storage)
-	return
+	return err
 }
 
 func initPackages() (err error) {
 	log.Info("Initialising Packages storage with type: %s", setting.Packages.Storage.Type)
 	Packages, err = NewStorage(setting.Packages.Storage.Type, &setting.Packages.Storage)
-	return
+	return err
 }