driver core: make bus_get_device_klist() static

No one calls this function outside of drivers/base/bus.c so make it
static so it does not need to be exported anymore.
Reviewed-by: Rafael J. Wysocki <rafael@kernel.org>
Link: https://lore.kernel.org/r/20230109175810.2965448-1-gregkh@linuxfoundation.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/base/bus.c

@@ -897,11 +897,10 @@ struct kset *bus_get_kset(struct bus_type *bus)
 }
 EXPORT_SYMBOL_GPL(bus_get_kset);
 
-struct klist *bus_get_device_klist(struct bus_type *bus)
+static struct klist *bus_get_device_klist(struct bus_type *bus)
 {
 	return &bus->p->klist_devices;
 }
-EXPORT_SYMBOL_GPL(bus_get_device_klist);
 
 /*
  * Yes, this forcibly breaks the klist abstraction temporarily.  It

include/linux/device/bus.h

@@ -287,6 +287,5 @@ extern int bus_unregister_notifier(struct bus_type *bus,
 #define BUS_NOTIFY_DRIVER_NOT_BOUND	0x00000008 /* driver fails to be bound */
 
 extern struct kset *bus_get_kset(struct bus_type *bus);
-extern struct klist *bus_get_device_klist(struct bus_type *bus);
 
 #endif