thinkpad-acpi: fix CONFIG_THINKPAD_ACPI_HOTKEY_POLL build problem

Fix this problem when CONFIG_THINKPAD_ACPI_HOTKEY_POLL is undefined:

  CHECK   drivers/platform/x86/thinkpad_acpi.c
drivers/platform/x86/thinkpad_acpi.c:1968:21: error: not an lvalue
  CC [M]  drivers/platform/x86/thinkpad_acpi.o
drivers/platform/x86/thinkpad_acpi.c: In function 'tpacpi_hotkey_driver_mask_set':
drivers/platform/x86/thinkpad_acpi.c:1968: error: lvalue required as left operand of assignment

Reported-by: Noah Dain <noahdain@gmail.com>
Reported-by: Audrius Kazukauskas <audrius@neutrino.lt>
Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/drivers/platform/x86/thinkpad_acpi.c b/drivers/platform/x86/thinkpad_acpi.c
index 3910f2f3eada..d93108d148fc 100644
--- a/drivers/platform/x86/thinkpad_acpi.c
+++ b/drivers/platform/x86/thinkpad_acpi.c
@@ -2235,7 +2235,9 @@ static int tpacpi_hotkey_driver_mask_set(const u32 mask)
 
         HOTKEY_CONFIG_CRITICAL_START
         hotkey_driver_mask = mask;
+#ifdef CONFIG_THINKPAD_ACPI_HOTKEY_POLL
         hotkey_source_mask |= (mask & ~hotkey_all_mask);
+#endif
         HOTKEY_CONFIG_CRITICAL_END
 
         rc = hotkey_mask_set((hotkey_acpi_mask | hotkey_driver_mask) &