EDAC, sb_edac: Fix logic when computing DIMM sizes on Xeon Phi

EDAC, sb_edac: Fix logic when computing DIMM sizes on Xeon Phi

Correct a typo introduced by

  d0cdf9003140 ("EDAC, sb_edac: Add Knights Landing (Xeon Phi gen 2) support")

As a result under some configurations DIMMs were not correctly
recognized. Problem affects only Xeon Phi architecture.

Signed-off-by: Hubert Chrzaniuk <[email protected]>
Acked-by: Aristeu Rozanski <[email protected]>
Cc: Mauro Carvalho Chehab <[email protected]>
Cc: linux-edac <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Borislav Petkov <[email protected]>