tipc: check skb_linearize() return value in tipc_disc_rcv()

If skb_linearize() fails in tipc_disc_rcv(), we need to free the skb instead of
handle it.

Fixes: 25b0b9c4 ("tipc: handle collisions of 32-bit node address hash values")
Signed-off-by: NYueHaibing <yuehaibing@huawei.com>
Acked-by: NJon Maloy <jmaloy@redhat.com>
Link: https://lore.kernel.org/r/20221119072832.7896-1-yuehaibing@huawei.comSigned-off-by: NJakub Kicinski <kuba@kernel.org>

net/tipc/discover.c

@@ -211,7 +211,10 @@ void tipc_disc_rcv(struct net *net, struct sk_buff *skb,
 	u32 self;
 	int err;
 
-	skb_linearize(skb);
+	if (skb_linearize(skb)) {
+		kfree_skb(skb);
+		return;
+	}
 	hdr = buf_msg(skb);
 
 	if (caps & TIPC_NODE_ID128)