arm64: psci: fix cpu_suspend to check idle state type for index

This fix rectifies the psci cpu_suspend implementation to check the
PSCI power state parameter type field associated with the requested idle
state index.

Acked-by: Lorenzo Pieralisi <[e-mail]>
Signed-off-by: Amit Daniel Kachhap <[e-mail]>
Signed-off-by: Will Deacon <[e-mail]>

arch/arm64/kernel/psci.c

···
 	if (WARN_ON_ONCE(!index))
 		return -EINVAL;
 
-	if (state->type == PSCI_POWER_STATE_TYPE_STANDBY)
+	if (state[index - 1].type == PSCI_POWER_STATE_TYPE_STANDBY)
 		ret = psci_ops.cpu_suspend(state[index - 1], 0);
 	else
 		ret = __cpu_suspend(index, psci_suspend_finisher);