misc: at25: Check proper value of chip length in FRAM case

Obviously the byte_len value should be checked from the chip
and not from at25->chip.

Fixes: fd307a4a ("nvmem: prepare basics for FRAM support")
Acked-by: NArnd Bergmann <arnd@arndb.de>
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20211125212729.86585-4-andriy.shevchenko@linux.intel.comSigned-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/eeprom/at25.c

@@ -433,9 +433,9 @@ static int at25_probe(struct spi_device *spi)
 			dev_err(&spi->dev, "Error: unsupported size (id %02x)\n", id[7]);
 			return -ENODEV;
 		}
-		chip.byte_len = int_pow(2, id[7] - 0x21 + 4) * 1024;
 
-		if (at25->chip.byte_len > 64 * 1024)
+		chip.byte_len = int_pow(2, id[7] - 0x21 + 4) * 1024;
+		if (chip.byte_len > 64 * 1024)
 			at25->chip.flags |= EE_ADDR3;
 		else
 			at25->chip.flags |= EE_ADDR2;