staging: iio: Remove superfluous flush_scheduled_work

None of these drivers ever schedule any work, so there is no need to flush any
scheduled work when the driver is removed.

Signed-off-by: Lars-Peter Clausen <lars@metafoo.de>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
4 files changed