usb_get_dev() is called in stub_device_alloc(). When stub_probe() fails
after that, usb_put_dev() needs to be called to release the reference.
Fix this by moving usb_put_dev() to sdev_free error path handling.
Find this by code review.
Fixes: 3ff67445750a ("usbip: fix error handling in stub_probe()")
Signed-off-by: Hangyu Hua <hbh25y@xxxxxxxxx>
Reviewed-by: Shuah Khan <skhan@xxxxxxxxxxxxxxxxxxx>
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v2: add more description of this patch.
v3: add how to find the problem.