sctp: remove the left unnecessary check for chunk in sctp_renege_events

Commit fb234035 ("sctp: remove the useless check in
sctp_renege_events") forgot to remove another check for
chunk in sctp_renege_events.

Dan found this when doing a static check.

This patch is to remove that check, and also to merge
two checks into one 'if statement'.

Fixes: fb234035 ("sctp: remove the useless check in sctp_renege_events")
Reported-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NXin Long <lucien.xin@gmail.com>
Acked-by: NMarcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Acked-by: NNeil Horman <nhorman@tuxdriver.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/sctp/stream_interleave.c

@@ -968,9 +968,8 @@ static void sctp_renege_events(struct sctp_ulpq *ulpq, struct sctp_chunk *chunk,
 						       needed);
 	}
 
-	if (chunk && freed >= needed)
-		if (sctp_ulpevent_idata(ulpq, chunk, gfp) <= 0)
-			sctp_intl_start_pd(ulpq, gfp);
+	if (freed >= needed && sctp_ulpevent_idata(ulpq, chunk, gfp) <= 0)
+		sctp_intl_start_pd(ulpq, gfp);
 
 	sk_mem_reclaim(asoc->base.sk);
 }