[PATCH 2/3] hwrng: stm32 - add support for STM32 HW RNG

[kbuild test robot]

Hi Daniel,

[auto build test results on v4.3-rc3 -- if it's inappropriate base, please ignore]


coccinelle warnings: (new ones prefixed by >>)

>> drivers/char/hw_random/stm32-rng.c:164:1-4: WARNING: end returns can be simpified

Please review and possibly fold the followup patch.

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