[SCTP]: Fix err_hdr assignment in sctp_init_cause.

The subh->err_hdr should point to the error header, not the data.
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

net/sctp/sm_make_chunk.c

@@ -124,8 +124,8 @@ void  sctp_init_cause(struct sctp_chunk *chunk, __be16 cause_code,
 	padlen = len % 4;
 	err.length  = htons(len);
 	len += padlen;
-	sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err);
-	chunk->subh.err_hdr = sctp_addto_chunk(chunk, paylen, payload);
+	chunk->subh.err_hdr = sctp_addto_chunk(chunk, sizeof(sctp_errhdr_t), &err);
+	sctp_addto_chunk(chunk, paylen, payload);
 }
 
 /* 3.3.2 Initiation (INIT) (1)