[PATCH 4.2.y-ckt 092/218] EDAC/sb_edac: Fix computation of channel address

[Luck, Tony]

> 4.2.8-ckt7 -stable review patch.  If anyone has any objections, please let me know.

Can you hold it for a bit?  There is a silly error in this which breaks the channel computation.

Also needs to check if address hashing is enabled.

So 1 or 2 follow up patches should be coming out soon and should be batched next to this patch.

-Tony