hwrng: cctrng - Add missing clk_disable_unprepare in cctrng_resume

commit 4b7acc85 upstream.

Add the missing clk_disable_unprepare() before return in
cctrng_resume().

Fixes: a583ed31 ("hwrng: cctrng - introduce Arm CryptoCell driver")
Cc: <stable@vger.kernel.org>
Signed-off-by: Gaosheng Cui <cuigaosheng1@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>