[ACPI] add static to function definitions

Signed-off-by: Adrian Bunk <bunk@stusta.de>
Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/drivers/acpi/pci_bind.c b/drivers/acpi/pci_bind.c
index a495568..2a718df 100644
--- a/drivers/acpi/pci_bind.c
+++ b/drivers/acpi/pci_bind.c
@@ -44,7 +44,8 @@
 	struct pci_dev *dev;
 };
 
-void acpi_pci_data_handler(acpi_handle handle, u32 function, void *context)
+static void acpi_pci_data_handler(acpi_handle handle, u32 function,
+				  void *context)
 {
 	ACPI_FUNCTION_TRACE("acpi_pci_data_handler");