mtd: nand: assign mtd->name in find_full_id_nand

This patch assigned the type->name to mtd->name when mtd->name is
NULL in function "find_full_id_nand".
mtd->name is NULL may cause some problem.

Signed-off-by: Cai Zhiyong <caizhiyong@huawei.com>
Acked-by: Huang Shijie <b32955@freescale.com>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>

drivers/mtd/nand/nand_base.c

@@ -3327,6 +3327,9 @@ static bool find_full_id_nand(struct mtd_info *mtd, struct nand_chip *chip,
 
 		*busw = type->options & NAND_BUSWIDTH_16;
 
+		if (!mtd->name)
+			mtd->name = type->name;
+
 		return true;
 	}
 	return false;