PM / Domains: Respect errors from genpd's ->power_off() callback

The current code in genpd_sync_power_off(), doesn't care about potential
errors being returned from genpd's ->power_off() callback.

Obviously this behaviour could lead to problems, such as incorrectly
setting the genpd's status to GPD_STATE_POWER_OFF, but also to incorrectly
decrease the subdomain count for the masters, which potentially allows them
to be powered off in the next recursive call to genpd_sync_power_off().

Let's fix this behaviour by bailing out when the ->power_off() callback
returns an error code.

Signed-off-by: Ulf Hansson <[email protected]>
Reviewed-by: Viresh Kumar <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Reviewed-by: Bartlomiej Zolnierkiewicz <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>

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