privileges

This problem is 4.1 specific. It doesn't affect 4.0 and was fixed
in 5.x before.

Having any mysql user who is allowed to issue multi table update
statement and any column/table grants, allows this user to update
any table on a server (mysql grant tables are not exception).

check_grant() accepts number of tables (in table list) to be checked
in 5-th param. While checking grants for multi table update, number
of tables must be 1. It must never be 0 (actually we have
DBUG_ASSERT(number > 0) in 5.x in grant_check() function).


mysql-test/r/grant.result:
  Addition to test case for bug#7391:
  - Added grant statement to trigger this problem in 4.1.
  - Fixed error messages.
mysql-test/t/grant.test:
  Addition to test case for bug#7391:
  - Added grant statement to trigger this problem in 4.1.
  - Fixed error messages.
sql/sql_update.cc:
  check_grant() accepts number of tables (in table list) to be checked
  in 5-th param. For this particular check number of tables must be 1.
  It must never be 0 (actually we have DBUG_ASSERT(number > 0) in 5.x
  in grant_check() function).