flow: remove unused sctp enum member

This caused some arrays to be larger than needed.

src/flow-private.h

@@ -68,7 +68,6 @@ enum {
     FLOW_PROTO_TCP = 0,
     FLOW_PROTO_UDP,
     FLOW_PROTO_ICMP,
-    FLOW_PROTO_SCTP,
     FLOW_PROTO_DEFAULT,
 
     /* should be last */

src/flow-util.c

@@ -101,8 +101,6 @@ uint8_t FlowGetProtoMapping(uint8_t proto)
             return FLOW_PROTO_UDP;
         case IPPROTO_ICMP:
             return FLOW_PROTO_ICMP;
-        case IPPROTO_SCTP:
-            return FLOW_PROTO_SCTP;
         default:
             return FLOW_PROTO_DEFAULT;
     }
@@ -117,8 +115,6 @@ uint8_t FlowGetReverseProtoMapping(uint8_t rproto)
             return IPPROTO_UDP;
         case FLOW_PROTO_ICMP:
             return IPPROTO_ICMP;
-        case FLOW_PROTO_SCTP:
-            return IPPROTO_SCTP;
         default:
             exit(EXIT_FAILURE);
     }