iio: adc: xilinx-ams: Use devm_delayed_work_autocancel() to simplify code

Use devm_delayed_work_autocancel() instead of hand writing it. This is
less verbose and saves a few lines of code.

devm_delayed_work_autocancel() uses devm_add_action() instead of
devm_add_action_or_reset(). This is fine, because if the underlying memory
allocation fails, no work has been scheduled yet. So there is nothing to
undo.

Signed-off-by: Christophe JAILLET <[email protected]>
Acked-by: Michal Simek <[email protected]>
Link: https://lore.kernel.org/r/2626e6a057e40cd2271ef0e5f81d12e607bad5b4.1644776929.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Jonathan Cameron <[email protected]>

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