net: lan966x: Remove a useless test in lan966x_ptp_add_trap()

vcap_alloc_rule() can't return NULL.

So remove some dead-code
Signed-off-by: NChristophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/27992ffcee47fc865ce87274d6dfcffe7a1e69e0.1670873784.git.christophe.jaillet@wanadoo.frSigned-off-by: NJakub Kicinski <kuba@kernel.org>

drivers/net/ethernet/microchip/lan966x/lan966x_ptp.c

@@ -76,8 +76,6 @@ static int lan966x_ptp_add_trap(struct lan966x_port *port,
 	vrule = vcap_alloc_rule(lan966x->vcap_ctrl, port->dev,
 				LAN966X_VCAP_CID_IS2_L0,
 				VCAP_USER_PTP, 0, rule_id);
-	if (!vrule)
-		return -ENOMEM;
 	if (IS_ERR(vrule))
 		return PTR_ERR(vrule);