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David Vrabel noticed that the wireless usb stack likes to call device_for_each_chile() with an empty bus. This used to work fine, but now oopses. This patch fixes the oops and makes the code behave like it used to. Reported-by: David Vrabel <david.vrabel@csr.com> Tested-by: David Vrabel <david.vrabel@csr.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>