[BUG] ebt_accept is not 64-bit clean

I was testing ebtables on my AMD64 and the among extension refused to 
work stating:

$ ebtables -A FORWARD --among-src 00:11:22:33:44:55 -j DROP
The kernel doesn't support a certain ebtables extension, consider recompiling your kernel or insmod the extension.

Even though I had ebt_among probed.  Looking at dmesg I get this:

Ebtables v2.0 registered
ebtables: among: wrong size: 1060against expected 1056, rounded to 1056
kernel msg: ebtables bug: please report to author: match->check failed

It seems likely there is a pointer in there that is assumed to be 4 
bytes instead of 8 bytes, but I don't see anything obvious from the 
source.  I'm using Debian 2.6.8-9-amd64-k8

Please CC me in response,
-Peter


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