tools/pamusb-conf: tighten --add-device logic #30
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Prevent pamusb-conf from creating a new device when that new device
collides with an existing node in the pam_usb configuration file.
Hit issue #14 and, after fixing per the comments, dug into the source and noticed that pamusb-conf will happily add colliding entries with
--add-device=<name>
. This patch prevents those collisions from happening.