[gnome-db] V4: fix memory leaks

[Phil Longstaff <plongstaff rogers com>]

The attached patch fixes some memory leaks where string values returned via g_object_get() are not freed.

I found one of these using valgrind and the others by code inspection.  I only looked at the main libgda directory, not at any providers (and I know there is at least 1 leak in the sqlite provider).  Is there any plan to inspect or run valgrind on the v4 code?

Phil

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