driver core: make driver_probe_device() static

It's only used inside drivers/base/dd.c

Signed-off-by: Julian Wiedmann <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/base/base.h

···
 					   struct device *parent);
 
 extern void driver_detach(struct device_driver *drv);
-extern int driver_probe_device(struct device_driver *drv, struct device *dev);
 extern void driver_deferred_probe_del(struct device *dev);
 extern void device_set_deferred_probe_reason(const struct device *dev,
 					     struct va_format *vaf);

drivers/base/dd.c

···
  *
  * If the device has a parent, runtime-resume the parent before driver probing.
  */
-int driver_probe_device(struct device_driver *drv, struct device *dev)
+static int driver_probe_device(struct device_driver *drv, struct device *dev)
 {
 	int ret = 0;