net: don't check if the socket is valid in ConnectSocketDirectly()

The socket is always valid (the underlying file descriptor is not
`INVALID_SOCKET`) when `ConnectSocketDirectly()` is called.

src/netbase.cpp

@@ -514,10 +514,6 @@ bool ConnectSocketDirectly(const CService &addrConnect, const Sock& sock, int nT
     // Create a sockaddr from the specified service.
     struct sockaddr_storage sockaddr;
     socklen_t len = sizeof(sockaddr);
-    if (sock.Get() == INVALID_SOCKET) {
-        LogPrintf("Cannot connect to %s: invalid socket\n", addrConnect.ToStringAddrPort());
-        return false;
-    }
     if (!addrConnect.GetSockAddr((struct sockaddr*)&sockaddr, &len)) {
         LogPrintf("Cannot connect to %s: unsupported network\n", addrConnect.ToStringAddrPort());
         return false;