ppc4xx_edac: Fix build error caused by wrong member access

Fix the following error

drivers/edac/ppc4xx_edac.c:977:45: error: request for member 'dimm' in something
not a structure or union

by changing member access to pointer dereference.
Signed-off-by: Pranith Kumar <bobby.prani@gmail.com>
Link: http://lkml.kernel.org/r/1408482646-22541-1-git-send-email-bobby.prani@gmail.com
CC: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Borislav Petkov <bp@suse.de>

drivers/edac/ppc4xx_edac.c

@@ -974,7 +974,7 @@ static int ppc4xx_edac_init_csrows(struct mem_ctl_info *mci, u32 mcopt1)
 		 * page size (PAGE_SIZE) or the memory width (2 or 4).
 		 */
 		for (j = 0; j < csi->nr_channels; j++) {
-			struct dimm_info *dimm = csi->channels[j].dimm;
+			struct dimm_info *dimm = csi->channels[j]->dimm;
 
 			dimm->nr_pages  = nr_pages / csi->nr_channels;
 			dimm->grain	= 1;