Public bug reported:

[ Impact ]

`pkcon install <pkg>` crashes after install, and likewise
`pkcon remove <pkg>` crashes after removal.

More in general, all pkcon transactions that prompt the user with a
question like "Proceed with changes? [N/y]" will crash after completing
the transaction.

This is fixed by correcting a reference counting issue which was causing
a double-free.

[ Test Case 1 ]
1. Run `pkcon install 2048`
2. Answer `n` to "Proceed with changes? [N/y]"
3. Verify that pkcon does not print
     GLib-GObject-CRITICAL **: 12:02:00.011: g_object_unref: assertion 
'G_IS_OBJECT (object)' failed

[ Test Case 2 ]
1. Run `pkcon install 2048`
2. Answer `y` to "Proceed with changes? [N/y]"
3. Complete the install
4. Verify that pkcon did not crash with segmentation fault

[ Where things could go wrong ]
If the fix is too broad, we could be leaking memory, but pkcon is not a daemon 
anyways.
If the fix is not broad enough, the issue might still be happening in specific 
cases we haven't tested.

** Affects: packagekit (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/2086771

Title:
  pkcon crashes in transaction with user prompt

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