xfrm: remove the unnecessary checking before call xfrm_pol_hold

xfrm_pol_hold will check its input with NULL
Signed-off-by: NLi RongQing <roy.qing.li@gmail.com>
Signed-off-by: NSteffen Klassert <steffen.klassert@secunet.com>

net/xfrm/xfrm_policy.c

@@ -1127,7 +1127,7 @@ static struct xfrm_policy *xfrm_policy_lookup_bytype(struct net *net, u8 type,
 			break;
 		}
 	}
-	if (ret)
+
 	xfrm_pol_hold(ret);
 fail:
 	read_unlock_bh(&net->xfrm.xfrm_policy_lock);
@@ -3211,7 +3211,6 @@ static struct xfrm_policy *xfrm_migrate_policy_find(const struct xfrm_selector *
 		}
 	}
 
-	if (ret)
 	xfrm_pol_hold(ret);
 
 	read_unlock_bh(&net->xfrm.xfrm_policy_lock);