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

在第519行中,“(rt_uint32_t *)msg”应改为“(rt_ubase_t *)msg”。
在第550行中,“(rt_uint32_t *)msg”应改为“(rt_ubase_t *)msg”。

In line 519, "(rt_uint32_t *)msg" should be changed to "(rt_ubase_t *)msg".
In line 550, "(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/arch/sys_arch.c

@@ -516,7 +516,7 @@ u32_t sys_arch_mbox_fetch(sys_mbox_t *mbox, void **msg, u32_t timeout)
             t = timeout / (1000/RT_TICK_PER_SECOND);
     }
 
-    ret = rt_mb_recv(*mbox, (rt_uint32_t *)msg, t);
+    ret = rt_mb_recv(*mbox, (rt_ubase_t *)msg, t);
 
     if(ret == -RT_ETIMEOUT)
         return SYS_ARCH_TIMEOUT;
@@ -547,7 +547,7 @@ u32_t sys_arch_mbox_tryfetch(sys_mbox_t *mbox, void **msg)
 {
     int ret;
 
-    ret = rt_mb_recv(*mbox, (rt_uint32_t *)msg, 0);
+    ret = rt_mb_recv(*mbox, (rt_ubase_t *)msg, 0);
 
     if(ret == -RT_ETIMEOUT)
         return SYS_ARCH_TIMEOUT;