MINOR: tcp/uxst/sockpair: use fd_want_send() instead of conn_xprt_want_send()

Just like previous commit, we don't need to pass through the connection
layer anymore to enable polling during a connect(), we know the FD, so
let's simply call fd_want_send().

src/proto_sockpair.c

@@ -332,7 +332,7 @@ static int sockpair_connect_server(struct connection *conn, int flags)
 		return SF_ERR_RESOURCE;
 	}
 
-	conn_xprt_want_send(conn);  /* for connect status, proxy protocol or SSL */
+	fd_want_send(fd);  /* for connect status, proxy protocol or SSL */
 	return SF_ERR_NONE;  /* connection is OK */
 }
 

src/proto_tcp.c

@@ -585,7 +585,7 @@ int tcp_connect_server(struct connection *conn, int flags)
 		return SF_ERR_RESOURCE;
 	}
 
-	conn_xprt_want_send(conn);  /* for connect status, proxy protocol or SSL */
+	fd_want_send(fd);  /* for connect status, proxy protocol or SSL */
 	return SF_ERR_NONE;  /* connection is OK */
 }
 

src/proto_uxst.c

@@ -587,7 +587,7 @@ static int uxst_connect_server(struct connection *conn, int flags)
 		return SF_ERR_RESOURCE;
 	}
 
-	conn_xprt_want_send(conn);  /* for connect status, proxy protocol or SSL */
+	fd_want_send(fd);  /* for connect status, proxy protocol or SSL */
 	return SF_ERR_NONE;  /* connection is OK */
 }