mtd: nftl: use %*ph to print small buffer

Use %*ph format to print small buffer as hex string.
Suggested-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: NAntonio Cardace <anto.cardace@gmail.com>
Signed-off-by: NBoris Brezillon <boris.brezillon@bootlin.com>

drivers/mtd/nftlmount.c

@@ -122,8 +122,7 @@ static int find_boot_record(struct NFTLrecord *nftl)
 		if (memcmp(buf, "ANAND", 6)) {
 			printk(KERN_NOTICE "ANAND header found at 0x%x in mtd%d, but went away on reread!\n",
 			       block * nftl->EraseSize, nftl->mbd.mtd->index);
-			printk(KERN_NOTICE "New data are: %02x %02x %02x %02x %02x %02x\n",
-			       buf[0], buf[1], buf[2], buf[3], buf[4], buf[5]);
+			printk(KERN_NOTICE "New data are: %6ph\n", buf);
 			continue;
 		}
 #endif