Driver is leaking OF node reference on memory allocation failure.
Acquire the OF node reference after memory allocation to fix this and
keep it simple.

Fixes: 5a2308da ("riscv: Add Canaan Kendryte K210 reset controller")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20240825-reset-cleanup-scoped-v1-2-03f6d834f8c0@linaro.orgSigned-off-by: Philipp Zabel <p.zabel@pengutronix.de>