malloc_uninit: 48 bytes of 'feeder' still allocated on cpu 1

[esmith]

A memory leak? plus an irq problem?

%kldunload snd_ich
. ..
dsp: Warning: ... 2 device refs still exist! ...
. ..
malloc_uninit: 48 bytes of 'feeder' still allocated on cpu 1
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%kldload snd_ich
. ..
pcm0: ... irq 9 at device ...
icu_unset: invalid handler 9 0x...
pcm0: unable to map interrupt
device_probe_and_attach: pcm0 attach returned 6
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