[PATCH -next] thinkpad_acpi: fix build, HOTKEY_POLL is optional

[Randy Dunlap <randy.dunlap@xxxxxxxxxx>]

From: Randy Dunlap <randy.dunlap@xxxxxxxxxx>

Fix optional part of driver to be built optionally:

drivers/platform/x86/thinkpad_acpi.c:6251: error: implicit declaration of function 'tpacpi_hotkey_driver_mask_set'

Signed-off-by: Randy Dunlap <randy.dunlap@xxxxxxxxxx>
---
 drivers/platform/x86/thinkpad_acpi.c |    2 ++
 1 file changed, 2 insertions(+)

--- linux-next-20091009.orig/drivers/platform/x86/thinkpad_acpi.c
+++ linux-next-20091009/drivers/platform/x86/thinkpad_acpi.c
@@ -6245,12 +6245,14 @@ static int __init brightness_init(struct
 	ibm_backlight_device->props.brightness = b & TP_EC_BACKLIGHT_LVLMSK;
 	backlight_update_status(ibm_backlight_device);
 
+#ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
 	vdbg_printk(TPACPI_DBG_INIT | TPACPI_DBG_BRGHT,
 			"brightness: registering brightness hotkeys "
 			"as change notification\n");
 	tpacpi_hotkey_driver_mask_set(hotkey_driver_mask
 				| TP_ACPI_HKEY_BRGHTUP_MASK
 				| TP_ACPI_HKEY_BRGHTDWN_MASK);;
+#endif
 	return 0;
 }
 
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