lwip-2.1.0: ethernetif.c: 修复编译过程中的警告/Fix compile-time warnings

在第334行中,“(rt_uint32_t*)&msg”应改为“(rt_ubase_t *)&msg”。
在第366行中,“(rt_uint32_t*)&msg”应改为“(rt_ubase_t *)&msg”。

In line 334, "(rt_uint32_t*)&msg" should be changed to "(rt_ubase_t *)&msg".
In line 366, "(rt_uint32_t*)&msg" should be changed to "(rt_ubase_t *)&msg".
Signed-off-by: NZhou Yanjie <zhou_yan_jie@163.com>

components/net/lwip-2.1.0/src/netif/ethernetif.c

@@ -331,7 +331,7 @@ static void eth_tx_thread_entry(void* parameter)
 
     while (1)
     {
-        if (rt_mb_recv(&eth_tx_thread_mb, (rt_uint32_t*)&msg, RT_WAITING_FOREVER) == RT_EOK)
+        if (rt_mb_recv(&eth_tx_thread_mb, (rt_ubase_t *)&msg, RT_WAITING_FOREVER) == RT_EOK)
         {
             struct eth_device* enetif;
 
@@ -363,7 +363,7 @@ static void eth_rx_thread_entry(void* parameter)
 
     while (1)
     {
-        if (rt_mb_recv(&eth_rx_thread_mb, (rt_uint32_t*)&device, RT_WAITING_FOREVER) == RT_EOK)
+        if (rt_mb_recv(&eth_rx_thread_mb, (rt_ubase_t *)&device, RT_WAITING_FOREVER) == RT_EOK)
         {
             struct pbuf *p;