sb_edac: Fix off-by-one error in number of channels

This prevented edac sysfs code from properly handling 6 channels
per memory controller.
Signed-off-by: Jim Snow <jim.snow@intel.com>
Signed-off-by: Lukasz Anaczkowski <lukasz.anaczkowski@intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/edac/edac_mc_sysfs.c

@@ -372,7 +372,7 @@ static int edac_create_csrow_object(struct mem_ctl_info *mci,
 {
 	int err, chan;
 
-	if (csrow->nr_channels >= EDAC_NR_CHANNELS)
+	if (csrow->nr_channels > EDAC_NR_CHANNELS)
 		return -ENODEV;
 
 	csrow->dev.type = &csrow_attr_type;