acpiphp: fix missing acpiphp_glue_exit()

acpiphp_glue_exit() needs to be called to unwind when no slots found.
(It fixes data corruption when reloading acpiphp driver with no such devices)

Signed-off-by: Akinobu Mita <akinobu.mita@gmail.com>
Signed-off-by: Kristen Carlson Accardi <kristen.c.accardi@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

drivers/pci/hotplug/acpiphp_core.c

@@ -303,8 +303,10 @@ static int __init init_acpi(void)
 	/* read initial number of slots */
 	if (!retval) {
 		num_slots = acpiphp_get_num_slots();
-		if (num_slots == 0)
+		if (num_slots == 0) {
+			acpiphp_glue_exit();
 			retval = -ENODEV;
+		}
 	}
 
 	return retval;