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When shutting down, the interface manager can be destroyed
before the `route_connected()` callback is called, which is
unexpected for the latter and can cause a crash.
Move the interface manager attachment code from the callback
to the place before the callback is registered using
`isc_nm_routeconnect()` function, which will make sure that
the interface manager will live at least until the callback
is called.
Make sure to detach the interface manager if the
`isc_nm_routeconnect()` function is not implemented, or when
the callback is called with a result value which differs from
`ISC_R_SUCCESS`.
(cherry picked from commit
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| irs | ||
| isc | ||
| isccc | ||
| isccfg | ||
| ns | ||
| .gitignore | ||
| Makefile.am | ||