Fix a regression (due to a typo) which caused spurious incorrect
argument errors for long data stream parameters if all forms of
logging were disabled (binary, general and slow logs).

mysql-test/t/mysql_client_test.test:
  Save the status of the slow_log.
sql/sql_prepare.cc:
  Add a missing logical NOT operator.
tests/mysql_client_test.c:
  Disable all query logs when running C tests. Fixes a omission
  when, slow log should have been disabled too.
  
  Run test case for Bug#54041 with query logs enabled and disabled.