Hotfix/sangshuduo/td 3633 taosdemo segfault (#5649)

* [TD-3633] <fix>: fix taosdemo segfault.

* [TD-3633] <fix>: fix taosdemo segfault.

use snprintf instead of sprintf.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>

src/kit/taosdemo/taosdemo.c

@@ -4455,7 +4455,7 @@ static int generateDataTail(char *tableName, int32_t tableSeq,
         break;
       }
 
-      buffer += sprintf(buffer, " %s", data);
+      buffer += snprintf(buffer, retLen + 1, "%s", data);
       k++;
       len += retLen;
       remainderBufLen -= retLen;