Bug#915093: Usage message lacks "--"s

[積丹尼 Dan Jacobson]

Package: xinput
Version: 1.6.2-1+b1
Severity: wishlist
File: /usr/share/man/man1/xinput.1.gz

Man page lists each option like "--this".
But Usage message just lists them like "this".
Try "xinput --help" to see them.