sound fixes for 3.19-rc7

This batch ended up being larger than wished, but there is nothing to
worry too much there.  Most of commits are for ASoC, a compress NULL
dereference fix, a fix for probe error handling, and the rest are
device-specific fixes.  In addition, we have a fix for a long-standing
but of seq-dummy driver, which just cuts off the buggy part in the
end.
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