hwrng: geode - Migrate to managed API
Use devm_ioremap and devm_hwrng_register instead of ioremap and hwrng_register. This removes error handling code. Also moved code around by removing goto statements. This improves code readability. Signed-off-by: PrasannaKumar Muralidharan <prasannatsmkumar@gmail.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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