dio: Remove unused dio_dev_driver()

This function was never used.

Signed-off-by: Geert Uytterhoeven <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

Author: geertu

include/linux/dio.h

@@ -247,10 +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 *);
-static inline struct dio_driver *dio_dev_driver(const struct dio_dev *d)
-{
-    return d->driver;
-}
 
 #define dio_resource_start(d) ((d)->resource.start)
 #define dio_resource_end(d)   ((d)->resource.end)