smb/server: fix refcount leak in smb2_open()

When ksmbd_vfs_getattr() fails, the reference count of ksmbd_file
must be released.

Suggested-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: ZhangGuoDong <zhangguodong@kylinos.cn>
Signed-off-by: ChenXiaoSong <chenxiaosong@kylinos.cn>
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: ZhangGuoDong

fs/smb/server/smb2pdu.c

@@ -3010,10 +3010,10 @@ int smb2_open(struct ksmbd_work *work)
 			file_info = FILE_OPENED;
 
 			rc = ksmbd_vfs_getattr(&fp->filp->f_path, &stat);
+			ksmbd_put_durable_fd(fp);
 			if (rc)
 				goto err_out2;
 
-			ksmbd_put_durable_fd(fp);
 			goto reconnected_fp;
 		}
 	} else if (req_op_level == SMB2_OPLOCK_LEVEL_LEASE)