udev: stop using "floppy" group

Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
udev: assign group "input" to all input devices

Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
udev: really exclude device-mapper from block device ownership event locking

Arguments were wrong order, no?
This fixes commits:

e918a1b5a94f270186dca59156354acd2a596494
3d06f4183470d42361303086ed9dedd29c0ffc1b

Signed-off-by: Anthony G. Basile <blueness@gentoo.org>
udev: check the return value from udev_enumerate_scan_devices

The return value from udev_enumerate_scan_devices was stored but
never used. I assume this was meant to be checked.

Signed-off-by: Anthony G. Basile <blueness@gentoo.org>