USB: usbip: drop redundant device reference

USB: usbip: drop redundant device reference

Driver core holds a reference to the USB device while it is bound to a
driver and there is no need to take additional references unless the
structure is needed after disconnect.

Drop the redundant device reference to reduce cargo culting, make it
easier to spot drivers where an extra reference is needed, and reduce
the risk of memory leaks when drivers fail to release it.

Signed-off-by: Johan Hovold <johan@kernel.org>
Link: https://patch.msgid.link/20260305133851.2952-3-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>