Revert "[net] clippy: needless_update"

This reverts commit 058699d0a2.

library/std/src/net/addr.rs

@@ -364,6 +364,7 @@ pub fn new(ip: Ipv6Addr, port: u16, flowinfo: u32, scope_id: u32) -> SocketAddrV
                 sin6_addr: *ip.as_inner(),
                 sin6_flowinfo: flowinfo,
                 sin6_scope_id: scope_id,
+                ..unsafe { mem::zeroed() }
             },
         }
     }