Hotfix/sangshuduo/td 3197 fix taosdemo coverity scan (#6208)

* [TD-3197] <fix>: fix taosdemo coverity scan issues.

* [TD-3197] <fix>: fix taosdemo coverity scan issue.

fix subscribeTest pids uninitialized.

* [TD-3197] <fix>: fix taosdemo coverity scan issues.

* [TD-3197] <fix>: fix coverity scan issues.

check super tbl info pointer.

* [TD-3197] <fix>: fix coverity scan issues.

move sub tbl query thread join into loop

* [TD-3197] <fix>: fix coverity scan issues.

remove unused variable

* [TD-3197] <fix>: fix coverity scan issues.

use more secure random library

* [TD-3197] <fix>: fix coverity scan issues.

use strncpy for more safe

* [TD-3197] <fix>: fix taosdemo coverity scan issue.

replace arc4random with rand().

* [TD-3197] <fix>: fix coverity scan issues.

check stb info pointer for start time

* [TD-3197] <fix>: fix coverity scan issues.

fix strcpy vulnerability

* [TD-3197] <fix>: fix taosdemo coverity scan issue.

modify taosdemoTest2. try to check database continously.

* [TD-3197] <fix>: taosdemo coverity scan issues.

* [TD-3197] <fix>: fix memory leak when parsing arguments.

* [TD-3197] <fix>: fix cmake strip arguments.

* [TD-3197] <fix>: taosdemo coverity scan.

fix cmake string manipulation.

* [TD-3197]<fix>: taosdemo coverity scan issue.

configDir buffer overwrite.

* [TD-3197]<fix>: coverity scan issue.

taosdump argument validation.

* [TD-3197]<fix>: taosdemo and taosdump coverity scan issues.

* [TD-3197]<fix>: taosdemo coverity scan.

append result buf to file. for develop branch.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

src/kit/taosdemo/taosdemo.c

@@ -1147,19 +1147,18 @@ static int queryDbExec(TAOS *taos, char *command, QUERY_TYPE type, bool quiet) {
 
 static void appendResultBufToFile(char *resultBuf, char *resultFile)
 {
-  FILE *fp = NULL;
-  if (resultFile[0] != 0) {
-    fp = fopen(resultFile, "at");
-    if (fp == NULL) {
-      errorPrint(
-              "%s() LN%d, failed to open result file: %s, result will not save to file\n",
-              __func__, __LINE__, resultFile);
-      return;
+    FILE *fp = NULL;
+    if (resultFile[0] != 0) {
+        fp = fopen(resultFile, "at");
+        if (fp == NULL) {
+            errorPrint(
+                    "%s() LN%d, failed to open result file: %s, result will not save to file\n",
+                    __func__, __LINE__, resultFile);
+            return;
+        }
+        fprintf(fp, "%s", resultBuf);
+        tmfclose(fp);
     }
-  }
-
-  fprintf(fp, "%s", resultBuf);
-  tmfclose(fp);
 }
 
 static void appendResultToFile(TAOS_RES *res, char* resultFile) {