dio: Make dio_match_device() static

Unlike its PCI counterpart, dio_match_device() was never used outside
the DIO bus code.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/r/20200112165613.20960-2-geert@linux-m68k.org

drivers/dio/dio-driver.c

@@ -25,7 +25,7 @@
  *  dio_device_id structure or %NULL if there is no match.
  */
 
-const struct dio_device_id *
+static const struct dio_device_id *
 dio_match_device(const struct dio_device_id *ids,
 		   const struct dio_dev *d)
 {
@@ -137,7 +137,6 @@ static int __init dio_driver_init(void)
 
 postcore_initcall(dio_driver_init);
 
-EXPORT_SYMBOL(dio_match_device);
 EXPORT_SYMBOL(dio_register_driver);
 EXPORT_SYMBOL(dio_unregister_driver);
 EXPORT_SYMBOL(dio_bus_type);

include/linux/dio.h

@@ -247,7 +247,6 @@ extern int dio_create_sysfs_dev_files(struct dio_dev *);
 /* New-style probing */
 extern int dio_register_driver(struct dio_driver *);
 extern void dio_unregister_driver(struct dio_driver *);
-extern const struct dio_device_id *dio_match_device(const struct dio_device_id *ids, const struct dio_dev *z);
 static inline struct dio_driver *dio_dev_driver(const struct dio_dev *d)
 {
     return d->driver;