coresight: Avoid casting void pointers

We don't need to cast void pointers, such as the amba_id data. Assign to
a local variable to make the code prettier and also return NULL instead
of 0 to make sparse happy.

Cc: Suzuki K Poulose <[email protected]>
Cc: Mike Leach <[email protected]>
Reviewed-by: Joe Perches <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>
Reviewed-by: Mike Leach <[email protected]>
Signed-off-by: Mathieu Poirier <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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