i82975x_edac: Test nr_pages earlier to save a few CPU cycles

Avoid test nr_pages twice, and initializing some data that won't
be used.

Cleanup patch only.
Reported-by: Aristeu Rozanski Filho <arozansk@redhat.com>
Reviewed-by: Aristeu Rozanski <arozansk@redhat.com>
Cc: Ranganathan Desikan <ravi@jetztechnologies.com>
Cc: "Arvind R." <arvino55@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/edac/i82975x_edac.c

@@ -410,6 +410,9 @@ static void i82975x_init_csrows(struct mem_ctl_info *mci,
 			cumul_size);
 
 		nr_pages = cumul_size - last_cumul_size;
+		if (!nr_pages)
+			continue;
+
 		/*
 		 * Initialise dram labels
 		 * index values:
@@ -420,9 +423,6 @@ static void i82975x_init_csrows(struct mem_ctl_info *mci,
 		for (chan = 0; chan < csrow->nr_channels; chan++) {
 			dimm = mci->csrows[index].channels[chan].dimm;
 
-			if (!nr_pages)
-				continue;
-
 			dimm->nr_pages = nr_pages / csrow->nr_channels;
 			strncpy(csrow->channels[chan].dimm->label,
 					labels[(index >> 1) + (chan * 2)],
@@ -433,9 +433,6 @@ static void i82975x_init_csrows(struct mem_ctl_info *mci,
 			dimm->edac_mode = EDAC_SECDED; /* only supported */
 		}
 
-		if (!nr_pages)
-			continue;	/* not populated */
-
 		csrow->first_page = last_cumul_size;
 		csrow->last_page = cumul_size - 1;
 		last_cumul_size = cumul_size;