scsi: libcxgbi: remove redundant check and close on csk

csk is always null on the error return path and so the non-null check
and call to cxgbi_sock_closed on csk is redundant and can be removed.

Detected by: CoverityScan CID#114329 ("Logically dead code")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Varun Prakash <varun@chelsio.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

drivers/scsi/cxgbi/libcxgbi.c

@@ -688,8 +688,6 @@ cxgbi_check_route(struct sockaddr *dst_addr, int ifindex)
 
 rel_rt:
 	ip_rt_put(rt);
-	if (csk)
-		cxgbi_sock_closed(csk);
 err_out:
 	return ERR_PTR(err);
 }