sctp: remove unused union (sctp_cmsg_data_t) definition

This patch removes an unused union definition (sctp_cmsg_data_t)
from include/net/sctp/user.h.

Signed-off-by: Rami Rosen <rosenrami@gmail.com>
Signed-off-by: Vlad Yasevich <vladislav.yasevich@hp.com>

include/net/sctp/user.h

@@ -210,12 +210,6 @@ enum sctp_sinfo_flags {
 };
 
 
-typedef union {
-	__u8   			raw;
-	struct sctp_initmsg	init;
-	struct sctp_sndrcvinfo	sndrcv;
-} sctp_cmsg_data_t;
-
 /* These are cmsg_types.  */
 typedef enum sctp_cmsg_type {
 	SCTP_INIT,              /* 5.2.1 SCTP Initiation Structure */