mtd: Use get_mtd_device_nm() to find named device in get_sb_mtd()

This removes the need to know the number of MTD devices.
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>

drivers/mtd/mtdsuper.c

@@ -150,19 +150,13 @@ int get_sb_mtd(struct file_system_type *fs_type, int flags,
 			DEBUG(1, "MTDSB: mtd:%%s, name \"%s\"\n",
 			      dev_name + 4);
 
-			for (mtdnr = 0; mtdnr < MAX_MTD_DEVICES; mtdnr++) {
-				mtd = get_mtd_device(NULL, mtdnr);
-				if (!IS_ERR(mtd)) {
-					if (!strcmp(mtd->name, dev_name + 4))
+			mtd = get_mtd_device_nm(dev_name + 4);
+			if (!IS_ERR(mtd))
 				return get_sb_mtd_aux(
 					fs_type, flags,
 					dev_name, data, mtd,
 					fill_super, mnt);
 
-					put_mtd_device(mtd);
-				}
-			}
-
 			printk(KERN_NOTICE "MTD:"
 			       " MTD device with name \"%s\" not found.\n",
 			       dev_name + 4);