bugfix: 1、change seccomp hook install order to enable seccomp in updater mode

2、增加空指针校验
Signed-off-by: Nxiacong <xiacong4@huawei.com>
Change-Id: I6680f4b198b9be420af804314ee2a239f506c4ad
Signed-off-by: Nxiacong <xiacong4@huawei.com>

Change-Id: I324ee31c372c3b2174bf86bb6698d7835e74dc97
Signed-off-by: Nxiacong <xiacong4@huawei.com>

services/modules/seccomp/seccomp_policy.c

@@ -121,7 +121,7 @@ static bool GetFilterFileByName(const char *filterName, char *filterLibRealPath,
     }
 
     // allow only one path to a seccomp shared library to avoid shared library replaced
-    if (seccompPathNum == 1) {
+    if (seccompPathNum == 1 && files && files->paths[0]) {
         if (memcpy_s(filterLibRealPath, pathSize, files->paths[0], strlen(files->paths[0]) + 1) == EOK) {
             flag = true;
         }

services/modules/seccomp/seccomp_policy_static.c

@@ -53,5 +53,5 @@ static int SeccompHook(const HOOK_INFO *info, void *cookie)
 
 MODULE_CONSTRUCTOR(void)
 {
-    InitAddPostPersistParamLoadHook(0, SeccompHook);
+    InitAddPostCfgLoadHook(0, SeccompHook);
 }