[media] wl128x: fix fmdbg compiler warning

fmdrv_common.c: In function 'fm_download_firmware':
fmdrv_common.c:1259:2: warning: format '%d' expects argument of type 'int', but argument 3 has type 'size_t' [-Wformat=]
   fmdbg("Firmware(%s) length : %d bytes\n", fw_name, fw_entry->size);
   ^
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>

drivers/media/radio/wl128x/fmdrv_common.c

@@ -1256,7 +1256,7 @@ static int fm_download_firmware(struct fmdev *fmdev, const u8 *fw_name)
 		fmerr("Unable to read firmware(%s) content\n", fw_name);
 		return ret;
 	}
-	fmdbg("Firmware(%s) length : %d bytes\n", fw_name, fw_entry->size);
+	fmdbg("Firmware(%s) length : %zu bytes\n", fw_name, fw_entry->size);
 
 	fw_data = (void *)fw_entry->data;
 	fw_len = fw_entry->size;