fix source address not being set in non REUSEPORT dialer

tcp.go

@@ -51,6 +51,12 @@ func (t *TcpTransport) Dialer(laddr ma.Multiaddr, opts ...tpt.DialOpt) (tpt.Dial
 	}
 	var base manet.Dialer
 
+	la, err := manet.ToNetAddr(laddr)
+	if err != nil {
+		return nil, err // something wrong with laddr.
+	}
+	base.Dialer.LocalAddr = la
+
 	var doReuse bool
 	for _, o := range opts {
 		switch o := o.(type) {
@@ -136,12 +142,6 @@ type tcpDialer struct {
 }
 
 func (t *TcpTransport) newTcpDialer(base manet.Dialer, laddr ma.Multiaddr, doReuse bool) (*tcpDialer, error) {
-	// get the local net.Addr manually
-	la, err := manet.ToNetAddr(laddr)
-	if err != nil {
-		return nil, err // something wrong with laddr.
-	}
-
 	var pattern mafmt.Pattern
 	if TCP4.Matches(laddr) {
 		pattern = TCP4
@@ -153,10 +153,7 @@ func (t *TcpTransport) newTcpDialer(base manet.Dialer, laddr ma.Multiaddr, doReu
 
 	if doReuse && ReuseportIsAvailable() {
 		rd := reuseport.Dialer{
-			D: net.Dialer{
-				LocalAddr: la,
-				Timeout:   base.Timeout,
-			},
+			D: base.Dialer,
 		}
 
 		return &tcpDialer{