[PATCH] ipw2200: fix error log offset calculation

This fixes a slab corruption issue in the ipw2200 driver: it essentially
multiplied the error log number _twice_ by the size of the error element
entry (once explicitly in the code, and once implicitly as part of the
regular pointer arithmetic).

Cc: Henrik Brix Andersen <brix@gentoo.org>
Cc: Bernard Blackham <bernard@blackham.com.au>
Cc: Zilvinas Valinskas <zilvinas@gemtek.lt>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Zhu Yi <yi.zhu@intel.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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