ibmvnic: Don't reference skb after sending to VIOS

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UBUNTU-CVE-2023-52456

In the Linux kernel, the following vulnerability has been resolved: serial: imx: fix tx statemachine deadlock When using the serial port as RS485 port, the tx statemachine is used to control the RTS pin to drive the RS485 transceiver TXEN pin. When the TTY port is closed in the middle of a...