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This function doesn't return and its callers that don't return either rely on this. Drop the dead attribute and add a panic() after it to make this expectation explicit. Calling `wfi` in the powerdown sequence is terminal so even if the function was made to return, there would be no functional change. This is useful for a following patch that makes psci_power_down_wfi() return. Change-Id: I62ca1ee058b1eaeb046966c795081e01bf45a2eb Signed-off-by: Boyan Karatotev <boyan.karatotev@arm.com>