Unregister fds in kill#245
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On FreeBSD, if we don't call
unregister, a stale source is left behind in polling's kqueue implementation.It becomes impossible to reuse that fd number, resulting in a crash for niri because of an
AlreadyExistserror (niri-wm/niri#4016).This change tracks dispatcher registration in
registerandreregister, and subsequently doesunregister(if necessary) whenkillis called.I've only tested this on FreeBSD with niri.