vsock: Update rx_bytes on read_skb()

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DEBIAN-CVE-2024-50169

In the Linux kernel, the following vulnerability has been resolved: vsock: Update rxbytes on readskb Make sure virtiotransportincrxpkt and virtiotransportdecrxpkt calls are balanced i.e. virtiovsocksock::rxbytes doesn't lie after vsocktransport::readskb. While here, also inform the peer that we'v...