Write ACPI sleep state to /sys/power/state instead of /proc/acpi/sleep

From http://acpi.sourceforge.net/documentation/sleep.html:

/proc/acpi is being replaced by interfaces in /sys and new software
should not look in /proc. Users of 2.6 are advised to use the new file
in sysfs: /sys/power/state.

Metalshark says:
February 15th, 2008 at 6:15 am

In shutdown you use “/proc/acpi/sleep”, would it be advisable to use the
new sysfs method and use that if available and if not use proc (at runtime)
with compile time options to disable proc/sysfs methods?

Signed-off-by: Claudio Matsuoka <cmatsuoka@gmail.com>

finit-alt.c

@@ -373,7 +373,7 @@ void shutdown(int sig)
 	if (sig == SIGINT || sig == SIGUSR1)
 		reboot(RB_AUTOBOOT);
 
-	if ((fd = open("/proc/acpi/sleep", O_WRONLY)) >= 0) {
+	if ((fd = open("/sys/power/state", O_WRONLY)) >= 0) {
 		write(fd, "5", 1);
 		close(fd);
 	}