sctp: remove the typedef sctp_errhdr_t

This patch is to remove the typedef sctp_errhdr_t, and replace
with struct sctp_errhdr in the places where it's using this
typedef.

It is also to use sizeof(variable) instead of sizeof(type).

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/sctp.h b/include/linux/sctp.h
index 553020c..d35bdd3 100644
--- a/include/linux/sctp.h
+++ b/include/linux/sctp.h
@@ -427,15 +427,15 @@ struct sctp_shutdown_chunk {
 
 /* RFC 2960.  Section 3.3.10 Operation Error (ERROR) (9) */
 
-typedef struct sctp_errhdr {
+struct sctp_errhdr {
 	__be16 cause;
 	__be16 length;
 	__u8  variable[0];
-} sctp_errhdr_t;
+};
 
 typedef struct sctp_operr_chunk {
 	struct sctp_chunkhdr chunk_hdr;
-	sctp_errhdr_t err_hdr;
+	struct sctp_errhdr err_hdr;
 } sctp_operr_chunk_t;
 
 /* RFC 2960 3.3.10 - Operation Error