Hotfix/sangshuduo/td 3197 taosdemo coverity scan for master (#7099)

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

* exit if read sample file failed.

* fix converity scan issue.

* fix coverity scan issue.

* fix coverity scan memory leak.

* fix resource leak reported by coverity scan.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

src/kit/taosdemo/taosdemo.c

@@ -6163,6 +6163,7 @@ static int32_t prepareStbStmt(
         if (0 != ret) {
             errorPrint("%s() LN%d, stmt_bind_param() failed! reason: %s\n",
                     __func__, __LINE__, taos_stmt_errstr(stmt));
+            free(bindArray);
             return -1;
         }
         // if msg > 3MB, break
@@ -6170,6 +6171,7 @@ static int32_t prepareStbStmt(
         if (0 != ret) {
             errorPrint("%s() LN%d, stmt_add_batch() failed! reason: %s\n",
                     __func__, __LINE__, taos_stmt_errstr(stmt));
+            free(bindArray);
             return -1;
         }