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Non-hub device has no child, and even a real USB hub has ports far less than USB_MAXCHILDREN, so there is no need using a fix array for child devices, just allocate it dynamically according real port number. Signed-off-by: Huajun Li <huajun.li.lee@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>