`exfatlabel` cannot rename a volume to `-V`

[fdegros]

When trying to use exfatlabel to rename a volume to -V, the following command is not effective:

$ exfatlabel /dev/sda "-V"
exfatlabel 1.3.0
Copyright (C) 2011-2018  Andrew Nayenko

The volume didn't get renamed. It still has its old name:

$ exfatlabel /dev/sda     
Old Name

Using the POSIX double hyphen delimiter -- doesn't work either.

$ exfatlabel -- /dev/sda "-V"
exfatlabel 1.3.0
Copyright (C) 2011-2018  Andrew Nayenko

$ exfatlabel -- /dev/sda "New Name"
Usage: exfatlabel [-V] <device> [label]

$ exfatlabel /dev/sda -- "-V"
exfatlabel 1.3.0
Copyright (C) 2011-2018  Andrew Nayenko

$ exfatlabel /dev/sda -- "New Name"
Usage: exfatlabel [-V] <device> [label]

The volume didn't get renamed. It still has its old name:

$ exfatlabel /dev/sda     
Old Name