Staging driver fixes for 3.11-rc5

Here are 3 small fixes for staging/IIO drivers for 3.11-rc5.  Nothing
huge, two IIO driver fixes, and a zcache fix.  All of these have been in
linux-next for a while.

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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