sctp: sctp_sendmsg: Don't test known non-null sinfo

It's already known non-null above.
Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/sctp/socket.c

@@ -1791,13 +1791,11 @@ SCTP_STATIC int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
 		goto out_free;
 	}
 
-	if (sinfo) {
 	/* Check for invalid stream. */
 	if (sinfo->sinfo_stream >= asoc->c.sinit_num_ostreams) {
 		err = -EINVAL;
 		goto out_free;
 	}
-	}
 
 	timeo = sock_sndtimeo(sk, msg->msg_flags & MSG_DONTWAIT);
 	if (!sctp_wspace(asoc)) {