acpi_button misses some static's

@@ -68,8 +68,8 @@
 MODULE_LICENSE("GPL");
 
 
-int acpi_button_add (struct acpi_device *device);
-int acpi_button_remove (struct acpi_device *device, int type);
+static int acpi_button_add (struct acpi_device *device);
+static int acpi_button_remove (struct acpi_device *device, int type);
 static int acpi_button_open_fs(struct inode *inode, struct file *file);
 
 static struct acpi_driver acpi_button_driver = {

@@ -236,7 +236,7 @@
 }
 
 
-int
+static int
 acpi_button_add (
 	struct acpi_device	*device)
 {

@@ -386,7 +386,7 @@
 }
 
 
-int
+static int
 acpi_button_remove (struct acpi_device *device, int type)
 {
 	acpi_status		status = 0;