Fix -EIO on /proc/acpi/events after suspends.  This actually breaks
suspending by power button in many setups.
Signed-off-by: NPavel Machek <pavel@suse.cz>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>