Revert "virtio/vsock: Fix uninit-value in virtio_transport_recv_pkt()"

This reverts commit cd12535b which is
commit 34c4effa upstream.

It needs to be reverted, as the function virtio_transport_free_pkt() is
in the stable Android ABI, and this function is removed in the 6.1.63
kernel as part of a series of fixes and optimizations of the virtio
networking connection.  To preserve the ABI (and thereby keeping the
slower interface), revert the commit for now.

If this needs to come back in the future, if performance for this
interface needs to be resolved, it can be done so in an ABI-safe way.

Bug: 161946584
Change-Id: If55ecc4e35feecb35d8dffb8ae05680f5599d1da
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>