Fix broken USB support for Linux host (Bjorn Danielsson)
Make "host:" usb devices work again on systems that have the
file /proc/bus/usb/devices. This was broken in r5441 due to
incorrect logic for the USB_FS_SYS case in usb_host_scan().
Signed-off-by: Bjorn Danielsson <bdq@dax.nu>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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