net: manual clean code which call skb_put_[data:zero]

Signed-off-by: yuan linyu <Linyu.Yuan@alcatel-sbell.com.cn>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/sctp/sm_make_chunk.c b/net/sctp/sm_make_chunk.c
index 2c196b3..4b19679 100644
--- a/net/sctp/sm_make_chunk.c
+++ b/net/sctp/sm_make_chunk.c
@@ -1474,11 +1474,10 @@ void sctp_chunk_put(struct sctp_chunk *ch)
 void *sctp_addto_chunk(struct sctp_chunk *chunk, int len, const void *data)
 {
 	void *target;
-	void *padding;
 	int chunklen = ntohs(chunk->chunk_hdr->length);
 	int padlen = SCTP_PAD4(chunklen) - chunklen;
 
-	padding = skb_put_zero(chunk->skb, padlen);
+	skb_put_zero(chunk->skb, padlen);
 	target = skb_put_data(chunk->skb, data, len);
 
 	/* Adjust the chunk length field.  */