usb-backend: Fix devices not being enumerated
This patch fixes bad filtering of USB devices.
The logic was introduced for windows clients in commit b8389376 but was moved in 2e19014e and executed also by non windows clients, resulting in this bug.
Fixes: 2e19014e "usb-redir: isolate usage of libusb and usbredirhost" Fixes: #157 (closed) Signed-off-by: Victor Toso victortoso@redhat.com