Revert all GetObjectNInfo related PRs (#6398)

* Revert "Encrypted reader wrapped in NewGetObjectReader should be closed (#6383)"

This reverts commit 53a0bbeb5b.

* Revert "Change SelectAPI to use new GetObjectNInfo API (#6373)"

This reverts commit 5b05df215a.

* Revert "Implement GetObjectNInfo object layer call (#6290)"

This reverts commit e6d740ce09.

cmd/gateway/oss/gateway-oss.go

@@ -69,7 +69,7 @@ ENVIRONMENT VARIABLES:
 
   DOMAIN:
      MINIO_DOMAIN: To enable virtual-host-style requests, set this value to Minio host domain name.
-
+	
   CACHE:
      MINIO_CACHE_DRIVES: List of mounted drives or directories delimited by ";".
      MINIO_CACHE_EXCLUDE: List of cache exclusion patterns delimited by ";".
@@ -547,27 +547,6 @@ func ossGetObject(ctx context.Context, client *oss.Client, bucket, key string, s
 	return nil
 }
 
-func (l *ossObjects) GetObjectNInfo(ctx context.Context, bucket, object string, rs *minio.HTTPRangeSpec) (objInfo minio.ObjectInfo, reader io.ReadCloser, err error) {
-	objInfo, err = l.GetObjectInfo(ctx, bucket, object)
-	if err != nil {
-		return objInfo, reader, err
-	}
-
-	startOffset, length := int64(0), objInfo.Size
-	if rs != nil {
-		startOffset, length = rs.GetOffsetLength(objInfo.Size)
-	}
-
-	pr, pw := io.Pipe()
-	objReader := minio.NewGetObjectReader(pr, nil, nil)
-	go func() {
-		err := l.GetObject(ctx, bucket, object, startOffset, length, pw, objInfo.ETag)
-		pw.CloseWithError(err)
-	}()
-
-	return objInfo, objReader, nil
-}
-
 // GetObject reads an object on OSS. Supports additional
 // parameters like offset and length which are synonymous with
 // HTTP Range requests.