nvmem: eeprom: at25: fix type compiler warnings

Fixes:
	drivers/misc/eeprom/at25.c:181:28: warning: field width should have type 'int', but argument has type 'unsigned long'
	drivers/misc/eeprom/at25.c:386:13: warning: cast to smaller integer type 'int' from 'const void *'
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Jiri Prchal <jiri.prchal@aksignal.cz>
Fixes: fd307a4a ("nvmem: prepare basics for FRAM support")
Link: https://lore.kernel.org/r/20210611142706.27336-1-jiri.prchal@aksignal.czSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/eeprom/at25.c

@@ -178,7 +178,7 @@ static ssize_t sernum_show(struct device *dev, struct device_attribute *attr, ch
 	struct at25_data *at25;
 
 	at25 = dev_get_drvdata(dev);
-	return sysfs_emit(buf, "%*ph\n", sizeof(at25->sernum), at25->sernum);
+	return sysfs_emit(buf, "%*ph\n", (int)sizeof(at25->sernum), at25->sernum);
 }
 static DEVICE_ATTR_RO(sernum);
 
@@ -379,11 +379,11 @@ static int at25_probe(struct spi_device *spi)
 	u8 sernum[FM25_SN_LEN];
 	int i;
 	const struct of_device_id *match;
-	int is_fram = 0;
+	unsigned long is_fram = 0;
 
 	match = of_match_device(of_match_ptr(at25_of_match), &spi->dev);
 	if (match)
-		is_fram = (int)match->data;
+		is_fram = (unsigned long)match->data;
 
 	/* Chip description */
 	if (!spi->dev.platform_data) {