[td-225] refactor code.

src/client/src/tscSystem.c

@@ -141,7 +141,7 @@ void taos_init_imp(void) {
   int64_t refreshTime = 10; // 10 seconds by default
   if (tscMetaCache == NULL) {
     tscMetaCache = taosCacheInit(TSDB_DATA_TYPE_BINARY, refreshTime, false, NULL, "tableMeta");
-    tscObjCache = taosCacheInit(TSDB_CACHE_PTR_KEY, refreshTime / 2, false, tscFreeSqlObjInCache, "sqlObj");
+    tscObjCache = taosCacheInit(TSDB_CACHE_PTR_KEY, refreshTime / 2, false, tscFreeRegisteredSqlObj, "sqlObj");
   }
 
   tscDebug("client is initialized successfully");

src/client/src/tscUtil.c

@@ -389,7 +389,7 @@ static void tscFreeSubobj(SSqlObj* pSql) {
  *
  * @param pSql
  */
-void tscFreeSqlObjInCache(void *pSql) {
+void tscFreeRegisteredSqlObj(void *pSql) {
   assert(pSql != NULL);
 
   SSqlObj** p = (SSqlObj**)pSql;