PM / Domains: Join state name and index in debugfs output

For low-power states, the state index is part of the state, hence join
them with a hyphen in the /sys/kernel/debug/pm_genpd/pm_genpd_summary
output. E.g. "off 0" becomes "off-0".

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Tested-by: Kevin Hilman <khilman@baylibre.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/base/power/domain.c

@@ -1892,7 +1892,7 @@ static int pm_genpd_summary_one(struct seq_file *s,
 	if (WARN_ON(genpd->status >= ARRAY_SIZE(status_lookup)))
 		goto exit;
 	if (genpd->status == GPD_STATE_POWER_OFF)
-		snprintf(state, sizeof(state), "%s %u",
+		snprintf(state, sizeof(state), "%s-%u",
 			 status_lookup[genpd->status], genpd->state_idx);
 	else
 		snprintf(state, sizeof(state), "%s",