mctp: remove duplicated assignment of pointer hdr

The pointer hdr is being initialized and also re-assigned with the
same value from the call to function mctp_hdr. Static analysis reports
that the initializated value is unused. The second assignment is
duplicated and can be removed.

Addresses-Coverity: ("Unused value").
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/mctp/af_mctp.c

@@ -170,7 +170,6 @@ static int mctp_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
 		/* TODO: expand mctp_skb_cb for header fields? */
 		struct mctp_hdr *hdr = mctp_hdr(skb);
 
-		hdr = mctp_hdr(skb);
 		addr = msg->msg_name;
 		addr->smctp_family = AF_MCTP;
 		addr->smctp_network = cb->net;