irqchip/aspeed-scu-ic: Fix irq_of_parse_and_map() return value

irqchip/aspeed-scu-ic: Fix irq_of_parse_and_map() return value

[ Upstream commit eb84bb3ceabe44616eb6d493fe14b2a7446b8bf1 ]

The irq_of_parse_and_map() returns 0 on failure, not a negative ERRNO.

Fixes: 002c111e43bd ("irqchip: Add Aspeed SCU interrupt controller")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20220423094227.33148-2-krzysztof.kozlowski@linaro.org
Signed-off-by: Sasha Levin <sashal@kernel.org>