xdp-trafficgen: Drop "the driver is missing support in this kernel version" text

The "Most likely the driver is missing support in this kernel version"
may not always be true (for instance because the support is just
disabled), so let's drop it from the check_iface_support() function.

Signed-off-by: Toke Høiland-Jørgensen <[email protected]>

Author: tohojo

xdp-trafficgen/xdp-trafficgen.c

@@ -108,8 +108,7 @@ static int check_iface_support(const struct iface *iface)
 			"Continuing anyway, but running may fail!\n",
 			iface->ifname, -err);
 	} else if (!(feature_flags & NETDEV_XDP_ACT_NDO_XMIT)) {
-		pr_warn("Interface %s does not support sending packets via XDP.\n"
-			"Most likely the driver is missing support in this kernel version.\n",
+		pr_warn("Interface %s does not support sending packets via XDP.\n",
 			iface->ifname);
 		return -EOPNOTSUPP;
 	}