Remove unused MaybeSetAddrName

This logic is a no-op since it was introduced in commit
f9f5cfc506.

m_addr_name is never initialized to the empty string, because
ToStringIPPort never returns an empty string.

src/test/fuzz/net.cpp

@@ -37,9 +37,6 @@ FUZZ_TARGET_INIT(net, initialize_net)
             [&] {
                 node.CloseSocketDisconnect();
             },
-            [&] {
-                node.MaybeSetAddrName(fuzzed_data_provider.ConsumeRandomLengthString(32));
-            },
             [&] {
                 const std::vector<bool> asmap = ConsumeRandomLengthBitVector(fuzzed_data_provider);
                 if (!SanityCheckASMap(asmap)) {