busybox-1.23.0-r1 does not set /dev/snd group properly

[Felix Janda]

With commit c3cf1e30a3022453311a7e9fe11d94c7a381640e the behavior
of mdev has changed.

I had to change the line

pcm.*	root:audio 660 =snd/

in my mdev.conf to

snd/pcm.*	root:audio 660

since the device name is now taken directly from the uevent file
(changing from pcmC0D0c to snd/pcmC0D0c) and does no longer match
the old rule.

If the behavior change is intended, examples/mdev_fat.conf should
be updated.

Felix