fix: singleflight should not reuse if connection local addr is set

Author: emiago

sip/transport_connection_pool.go

@@ -55,15 +55,16 @@ func (p *ConnectionPool) addSingleflight(raddr Addr, laddr Addr, reuse bool, do
 
 	if laddr.Port > 0 || reuse {
 		// TODO: remplement this here to avoid type conversion
-		if c := p.Get(a); c != nil {
-			return c, nil
-		}
 
 		laddrStr := laddr.String()
 		if laddr.Port > 0 {
 			if c := p.Get(laddrStr); c != nil {
 				return c, nil
 			}
+		} else {
+			if c := p.Get(a); c != nil {
+				return c, nil
+			}
 		}
 
 		conn, err, _ := p.sf.Do(laddrStr+a, func() (any, error) {