Revert "net/packet: fix overflow in tpacket_rcv"

This reverts commit c4acc0748bb3769f9fbcec280b103779d78ca68e.

Reason for revert: This change does not compile.

Change-Id: Icf1b6664af5dac7aa3e649fd1a23949783c4db1b
Reviewed-on: https://cos-review.googlesource.com/c/third_party/kernel/+/5041
Reviewed-by: Robert Kolchmeyer <rkolchmeyer@google.com>
Tested-by: Robert Kolchmeyer <rkolchmeyer@google.com>