Revert "net: sctp: convert sctp_checksum_disable module param into sctp sysctl"

This reverts commit cda5f98e36576596b9230483ec52bff3cc97eb21.

As per Vlad's request.

Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 78eedf0..422db6c 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -135,6 +135,10 @@
 	/* This is the sctp port control hash.	*/
 	int port_hashsize;
 	struct sctp_bind_hashbucket *port_hashtable;
+
+	/* Flag to indicate whether computing and verifying checksum
+	 * is disabled. */
+        bool checksum_disable;
 } sctp_globals;
 
 #define sctp_max_instreams		(sctp_globals.max_instreams)
@@ -146,6 +150,7 @@
 #define sctp_assoc_hashtable		(sctp_globals.assoc_hashtable)
 #define sctp_port_hashsize		(sctp_globals.port_hashsize)
 #define sctp_port_hashtable		(sctp_globals.port_hashtable)
+#define sctp_checksum_disable		(sctp_globals.checksum_disable)
 
 /* SCTP Socket type: UDP or TCP style. */
 typedef enum {