[Bug 240039] Setting a mixer device with an empty string (`mixer pcm ""`) does not return

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=240039

            Bug ID: 240039
           Summary: Setting a mixer device with an empty string (`mixer
                    pcm ""`) does not return
           Product: Base System
           Version: 11.2-RELEASE
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs at FreeBSD.org
          Reporter: 0mp at FreeBSD.org

The mixer(8) command does not return if I use it to set a value of one of mixer
devices to an empty string, for example `mixer pcm ""`. It does not make much
sense to set the value to an empty string, but I should get at least an error
message.

Tested on FreeBSD 10.4-RELEASE and FreeBSD 13.0-CURRENT.

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