UBUNTU (pre-stable) Natty: ALSA: pcm: fix infinite loop in snd_pcm_update_hw_ptr0()

[David Henningsson]

While this hasn't reached all trees yet, I think we should pick it up 
ASAP, due to what it prevents: hard lockups with interrupts disabled.

-- 
David Henningsson, Canonical Ltd.
http://launchpad.net/~diwic
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