sunrpc: remove redundant initialization of sock

sock is being initialized and then being almost immediately updated
hence the initialized value is not being used and is redundant. Remove
the initialization. Cleans up clang warning:

warning: Value stored to 'sock' during its initialization is never read
Signed-off-by: NColin Ian King <colin.king@canonical.com>
Signed-off-by: NTrond Myklebust <trond.myklebust@primarydata.com>

net/sunrpc/xprtsock.c

@@ -2203,7 +2203,7 @@ static void xs_udp_setup_socket(struct work_struct *work)
 	struct sock_xprt *transport =
 		container_of(work, struct sock_xprt, connect_worker.work);
 	struct rpc_xprt *xprt = &transport->xprt;
-	struct socket *sock = transport->sock;
+	struct socket *sock;
 	int status = -EIO;
 
 	sock = xs_create_sock(xprt, transport,