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Fix memory leaks

Benoit Pierre requested to merge benoit-pierre/perl-glib-object-introspection:fix_memory_leaks into master

I'm seeing increasing memory use when implementing a custom model for use with Gtk's TreeView widget, or when using a data func with a standard ListStore model. After investigation, I believe this is because in invoke_perl_code's implementation, calls to gperl_alloc_temp (in prepare_invocation_info, via _prepare_perl_invocation_info) don't occur between ENTER; SAVETMPS; and FREETMPS; LEAVE;.

Additionally, there seem to be a missing call to g_base_info_unref in _fill_ffi_return_value.

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