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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.org

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>