test

discovery: don't panic on libmdns errors #2205

Job	Run time
cargo fmt	6s
cargo +stable clippy (ubuntu-latest)	2m 51s
cargo +1.75 check (windows-latest)	4m 42s
cargo +stable check (windows-latest)	6m 36s
cargo +1.75 check (ubuntu-latest)	3m 51s
cross +1.75 build armv7-unknown-linux-gnueabihf	56s
cargo +stable check (ubuntu-latest)	4m 54s
cross +stable build armv7-unknown-linux-gnueabihf	1m 3s
cargo +beta check (ubuntu-latest)	2m 55s
cross +1.75 build aarch64-unknown-linux-gnu	1m 6s
cross +stable build aarch64-unknown-linux-gnu	57s
cross +1.75 build riscv64gc-unknown-linux-gnu	59s
cross +stable build riscv64gc-unknown-linux-gnu	53s
	31m 49s

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