Fix some compilation warning (#5744)

* Fix some compilation warning

* 补充修正一些数据类型的使用错误

Co-authored-by: Meco Man <920369182@qq.com>

src/kservice.c

@@ -287,7 +287,7 @@ RT_WEAK void *rt_memcpy(void *dst, const void *src, rt_ubase_t count)
     char *src_ptr = (char *)src;
     long *aligned_dst;
     long *aligned_src;
-    int len = count;
+    rt_ubase_t len = count;
 
     /* If the size is small, or either SRC or DST is unaligned,
     then punt into the byte copy loop.  This should be rare. */

src/mem.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006-2021, RT-Thread Development Team
+ * Copyright (c) 2006-2022, RT-Thread Development Team
  *
  * SPDX-License-Identifier: Apache-2.0
  *
@@ -290,10 +290,14 @@ void *rt_smem_alloc(rt_smem_t m, rt_size_t size)
     RT_ASSERT(rt_object_is_systemobject(&m->parent));
 
     if (size != RT_ALIGN(size, RT_ALIGN_SIZE))
+    {
         RT_DEBUG_LOG(RT_DEBUG_MEM, ("malloc size %d, but align to %d\n",
                                     size, RT_ALIGN(size, RT_ALIGN_SIZE)));
+    }
     else
+    {
         RT_DEBUG_LOG(RT_DEBUG_MEM, ("malloc size %d\n", size));
+    }
 
     small_mem = (struct rt_small_mem *)m;
     /* alignment size */

src/timer.c

@@ -832,7 +832,7 @@ static void _timer_thread_entry(void *parameter)
  */
 void rt_system_timer_init(void)
 {
-    int i;
+    rt_size_t i;
 
     for (i = 0; i < sizeof(_timer_list) / sizeof(_timer_list[0]); i++)
     {