[Nouveau] nouveau_pm.c: Build error

[Stratos Psomadakis]

In nouveau_pm.c, in the function nouveau_pm_acpi_event(), there's no
check for CONFIG_POWER_SUPPLY.

If CONFIG_POWER_SUPPLY is set to either n or m, the
power_supply_is_system_supplied() is 'missing' and there's a build error.

One solution is to add an #ifdef CONFIG_POWER_SUPPLY along with the
#ifdef CONFIG_ACPI before the function.

-- 
Stratos Psomadakis
<psomas at ece.ntua.gr>


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