usbip: fix error handling in stub_probe()
usbip: fix error handling in stub_probe()

If usb_hub_claim_port() fails, no resources are deallocated and
if stub_add_files() fails, port is not released.

The patch fixes these issues and rearranges error handling code.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <a9985f635ca4eb5d7c64df6d16c76aa9811509c5@ispras.ru>
Acked-by: Valentina Manea <b65fbce2db68cabc5fb74ad65f0c94cef8963ea9@gmail.com>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs