RxRPC: Declare the security index constants symbolically

Declare the security index constants symbolically rather than just referring
to them numerically.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/rxrpc/rxkad.c b/net/rxrpc/rxkad.c
index ef8f910..acec762 100644
--- a/net/rxrpc/rxkad.c
+++ b/net/rxrpc/rxkad.c
@@ -42,7 +42,7 @@
 	__be32	checksum;	/* decrypted data checksum */
 };
 
-MODULE_DESCRIPTION("RxRPC network protocol type-2 security (Kerberos)");
+MODULE_DESCRIPTION("RxRPC network protocol type-2 security (Kerberos 4)");
 MODULE_AUTHOR("Red Hat, Inc.");
 MODULE_LICENSE("GPL");
 
@@ -506,7 +506,7 @@
 	if (!call->conn->cipher)
 		return 0;
 
-	if (sp->hdr.securityIndex != 2) {
+	if (sp->hdr.securityIndex != RXRPC_SECURITY_RXKAD) {
 		*_abort_code = RXKADINCONSISTENCY;
 		_leave(" = -EPROTO [not rxkad]");
 		return -EPROTO;
@@ -1122,7 +1122,7 @@
 static struct rxrpc_security rxkad = {
 	.owner				= THIS_MODULE,
 	.name				= "rxkad",
-	.security_index			= RXKAD_VERSION,
+	.security_index			= RXRPC_SECURITY_RXKAD,
 	.init_connection_security	= rxkad_init_connection_security,
 	.prime_packet_security		= rxkad_prime_packet_security,
 	.secure_packet			= rxkad_secure_packet,