[Bug 212336] vale-ctl -l fails without argument

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212336

            Bug ID: 212336
           Summary: vale-ctl -l fails without argument
           Product: Base System
           Version: 11.0-RC1
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: tcovert+freebsd at sahuagin.net
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Running 'vale-ctl -l' passes a null as an argument. Workaround is
'vale-ctl -l ""', to list all vale interfaces.


Building vale switch to test netmap.
vale-ctl -h vale1:bridge0

vale-ctl -l
vale-ctl: option requires an argument -- l
bad option ? (null)Usage:
vale-ctl arguments
        -g interface    interface name to get info
        -d interface    interface name to be detached
        -a interface    interface name to be attached
        -h interface    interface name to be attached with the host stack
        -n interface    interface name to be created
        -r interface    interface name to be deleted
        -l list all or specified bridge's interfaces (default)
        -C string ring/slot setting of an interface creating by -n

vale-ctl -l ""
bdg_ctl [149] bridge:0 port:0 vale1:bridge0
bdg_ctl [149] bridge:0 port:1 vale1:bridge0^

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