vfs: fix race condition detected by serve ftp tests
vfs: fix race condition detected by serve ftp tests

ncw/rclone,B4dM4n/rclone,olihey/rclone,B4dM4n/rclone,ncw/rclone,B4dM4n/rclone,olihey/rclone,B4dM4n/rclone,ncw/rclone,olihey/rclone,olihey/rclone,ncw/rclone