Michael Olbrich 19a6742fc2 gdbusconnection: don't cache G_IO_ERROR_CANCELLED errors
It can cause failures for shared connection objects.

What can currently happen is this:
1. A user starts to asynchronously create a proxy object
2. A user starts to asynchronously create another proxy object

At this point, the asynchronous initialization for the two proxy objects
share the not yet initialized connection object.

3. While the shared connection objected is created, the user cancels the
   creation with the supplied cancellable from the fist proxy object.
4. initable_init caches the canceled error and marks the connection as
   initialized.
5. The initialization of the second proxy object fails with the same
   canceled error.

To avoid this, clear the error in this case and destroy any member
variables that may have been created before the creation was canceled.

This way, the initialization of the second proxy object will restart the
connection initialization and with probably succeed.

Signed-off-by: Michael Olbrich <m.olbrich@pengutronix.de>
2023-12-11 14:17:14 +00:00
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