'unicode' test segmentation fault on s390x due to pointer casting

Test 'unicode' is failing with segmentaion fault on s390x.

At ma_error.c:289 casting of (MARIADB_CHARSET_INFO **) into (Client_Charset *) is done which causes garbage values on s390x but not on x86.

Creating a new Client_Charset object and passing its address to MADB_SetString is fixing the segmentation fault at this point,

  if (SQLState){

        Client_Charset utf8_={CP_UTF8,mariadb_get_charset_by_name("utf8")};

    MADB_SetString(isWChar ?  &utf8_ : 0, (void *)SQLState, SQL_SQLSTATE_SIZE + 1,

                   SqlStateVersion, SQL_SQLSTATE_SIZE, &InternalError);

}

but after execution goes ahead segmentation fault occurs at ma_error.c:289

if (MessageText)

     Length=  (SQLSMALLINT)MADB_SetString(isWChar ?  &utf8 : 0, (void*)MessageText, BufferLength,

                   Err->SqlErrorMsg, strlen(Err->SqlErrorMsg), &InternalError);

Could you please suggest a fix?

Attached gdb logs for s390x and x86.