usb: usbtest: fix NULL pointer dereference

usb: usbtest: fix NULL pointer dereference

If the usbtest driver encounters a device with an IN bulk endpoint but
no OUT bulk endpoint, it will try to dereference a NULL pointer
(out->desc.bEndpointAddress).  The problem can be solved by adding a
missing test.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-by: Andrey Konovalov <andreyknvl@google.com>
Tested-by: Andrey Konovalov <andreyknvl@google.com>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
(cherry picked from commit 7c80f9e4a588f1925b07134bb2e3689335f6c6d8)

Orabug: 27602322
CVE: CVE-2017-16532
Signed-off-by: Tim Tianyang Chen <tianyang.chen@oracle.com>
Reviewed-by: Ashok Vairavan <ashok.vairavan@oracle.com>