USB CD Eject Failures

Been playing around with sysutils/eject to automate some media backup stuff.

I note that "after a number of ejects" the USB 2 CD drive will cease 
responding.  I don't think its a race to failure, it acts like resource 
starvation/leak.  Seems fairly reproducible, if someone gets to it 
before I do, let me know.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261961

I suspect that something has changed in the 12 years since 
sysutils/eject was last looked at and the CDIOCEJECT case in 
sys/cam/scsi_cd.c probably needs an eyeball.

The close tray command also seems nonfunctional, which probably means 
that a data structure has changed or something else that I haven't 
started at in quite some time.

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261936

sean