mtd: parsers: tplink_safeloader: fix uninitialized variable bug

On 64 bit systems, the highest 32 bits of the "offset" variable are
not initialized.  Also the existing code is not endian safe (it will
fail on big endian systems).  Change the type of "offset" to a u32.

Fixes: aec4d5f5ffd0 ("mtd: parsers: add TP-Link SafeLoader partitions table parser")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Rafał Miłecki <rafal@milecki.pl>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/Y1gCALFWXYYwqV1P@kili

drivers/mtd/parsers/tplink_safeloader.c

@@ -23,8 +23,8 @@ static void *mtd_parser_tplink_safeloader_read_table(struct mtd_info *mtd)
 	struct safeloader_cmn_header hdr;
 	struct device_node *np;
 	size_t bytes_read;
-	size_t offset;
 	size_t size;
+	u32 offset;
 	char *buf;
 	int err;
 
@@ -34,14 +34,14 @@ static void *mtd_parser_tplink_safeloader_read_table(struct mtd_info *mtd)
 	else
 		np = of_get_child_by_name(np, "partitions");
 
-	if (of_property_read_u32(np, "partitions-table-offset", (u32 *)&offset)) {
+	if (of_property_read_u32(np, "partitions-table-offset", &offset)) {
 		pr_err("Failed to get partitions table offset\n");
 		goto err_put;
 	}
 
 	err = mtd_read(mtd, offset, sizeof(hdr), &bytes_read, (uint8_t *)&hdr);
 	if (err && !mtd_is_bitflip(err)) {
-		pr_err("Failed to read from %s at 0x%zx\n", mtd->name, offset);
+		pr_err("Failed to read from %s at 0x%x\n", mtd->name, offset);
 		goto err_put;
 	}