pwm: sun4i: Propagate errors in .get_state() to the caller

.get_state() can return an error indication now. Make use of it to
propagate an impossible prescaler encoding, should that have sneaked in
somehow.
Also check the return value of clk_get_rate(). That's unlikely to fail,
but we use that in two divide operations down in the code, so let's
avoid a divide-by-zero condition on the way.

Signed-off-by: Andre Przywara <[email protected]>
Reviewed-by: Uwe Kleine-König <[email protected]>
Reviewed-by: Samuel Holland <[email protected]>
Reviewed-by: Jernej Skrabec <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Uwe Kleine-König <[email protected]>
Signed-off-by: Thierry Reding <[email protected]>

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