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commit 48a61e1e upstream.

Add proper error path (for disabling runtime PM) when registering of
hwrng fails.

Fixes: b329669e

 ("hwrng: exynos - Add support for Exynos random number generator")
Signed-off-by: Krzysztof Kozlowski <k.kozlowski@samsung.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Jiri Slaby <jslaby@suse.cz>