DPL: fix how many forwarded parts are needed

In principle this is not fatal because the number of routes is always
larger / equal than the number of channels by construction.

Better safe than sorry.

Author: ktf

Framework/Core/src/DataProcessingHelpers.cxx

@@ -343,9 +343,7 @@ auto DataProcessingHelpers::routeForwardedMessageSet(FairMQDeviceProxy& proxy,
                                                      const bool copyByDefault, bool consume) -> std::vector<fair::mq::Parts>
 {
   // we collect all messages per forward in a map and send them together
-  std::vector<fair::mq::Parts> forwardedParts;
-  forwardedParts.resize(proxy.getNumForwards());
-  std::vector<ChannelIndex> forwardingChoices{};
+  std::vector<fair::mq::Parts> forwardedParts(proxy.getNumForwardChannels());
 
   for (size_t ii = 0, ie = currentSetOfInputs.size(); ii < ie; ++ii) {
     auto span = std::span<fair::mq::MessagePtr>(currentSetOfInputs[ii].messages);