[lwip-devel] mdns needs update in case of passing combination of flags to reason arg of netif_invoke_ext_callback()

[Axel Lin]

Hi,
After commit 734b6ab57a5f (netif: ensure netif_set_addr() only results
in one "ext_status_callback"),
it looks like the reason arg for netif_invoke_ext_callback() can be
set by a combination of flags.
Then the checking in mdns.c needs update because the switch case only
assume one flag to be set.

BTW, using enum (netif_nsc_reason_t) seems a little bit confusion as
it's currently means flags.

Regards,
Axel