[gnome-db] V4: fix more memory leaks

[Phil Longstaff <plongstaff rogers com>]

The attached patch fixes 2 memory leaks in the sqlite provider on the V4 trunk:

1) In some cases, while executing a statement, a new pstmt will be allocated but not saved.  It is, also, not unref'ed.

2) Simple case of a string malloc'ed but not freed

Phil

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