ike: propagate version-specific parser result

Ticket: 8961.

rust/src/ike/ike.rs

@@ -217,13 +217,12 @@ impl IKEState {
                 }
 
                 if isakmp_header.maj_ver == 1 {
-                    handle_ikev1(self, current, isakmp_header, direction);
+                    return handle_ikev1(self, current, isakmp_header, direction);
                 } else if isakmp_header.maj_ver == 2 {
-                    handle_ikev2(self, current, isakmp_header, direction);
+                    return handle_ikev2(self, current, isakmp_header, direction);
                 } else {
                     return AppLayerResult::err();
                 }
-                return AppLayerResult::ok(); // todo either remove outer loop or check header length-field if we have completely read everything
             }
             Err(Err::Incomplete(_)) => {
                 SCLogDebug!("Insufficient data while parsing IKE");