fix:修复使用无符号数接收sprintf_s的结果的问题

sprintf_s的返回值是有符号数，应使用有符号数来接收返回值
Signed-off-by: Nyinjiaming <yinjiaming@huawei.com>
Change-Id: Icb1248e0a75a77c1258f64dfa25eef0a7f5dd14e

kernel/base/container/los_uts_container.c

@@ -38,7 +38,7 @@ STATIC UINT32 g_currentUtsContainerNum;
 
 STATIC UINT32 InitUtsContainer(struct utsname *name)
 {
-    UINT32 ret = sprintf_s(name->sysname, sizeof(name->sysname), "%s", KERNEL_NAME);
+    INT32 ret = sprintf_s(name->sysname, sizeof(name->sysname), "%s", KERNEL_NAME);
     if (ret < 0) {
         return LOS_NOK;
     }