[TYPO3-core] RFC #10490: Code cleanup/Bugfix: Add some sql_free_result to the admin_get_* functions

[Oliver Klee]

This is an SVN patch request.

Type: Code cleanup/Bugfix

Bugtracker references:
http://bugs.typo3.org/view.php?id=10490

Branches:
TYPO3_4-1, TYPO3_4-2 and trunk

Problem:
The admin_get_* functions don't free their DB query results, but they
should (because SHOW queries create results that can be freed).

Solution:
Add the missing sql_free_result to admin_get_tables, admin_get_fields,
admin_get_keys and admin_get_charsets.

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