acpiphp: fix latch status

pci_hotplug.h says:

 * @latch_status: if the latch (if any) is open or closed (1/0)

However, acpiphp returns opposite value.
This patch fixes this issue.

I tested this patch on my ia64 machine that has some apciphp based
hotplug slots.

Signed-off-by: MUNEDA Takahiro <muneda.takahiro@jp.fujitsu.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_glue.c

@@ -1807,8 +1807,8 @@ u8 acpiphp_get_power_status(struct acpiphp_slot *slot)
 
 
 /*
- * latch closed:  1
- * latch   open:  0
+ * latch   open:  1
+ * latch closed:  0
  */
 u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
 {
@@ -1816,7 +1816,7 @@ u8 acpiphp_get_latch_status(struct acpiphp_slot *slot)
 
 	sta = get_slot_status(slot);
 
-	return (sta & ACPI_STA_SHOW_IN_UI) ? 1 : 0;
+	return (sta & ACPI_STA_SHOW_IN_UI) ? 0 : 1;
 }