[2994] Compilation fix in Dhcp4Srv

src/bin/dhcp4/dhcp4_srv.cc

@@ -608,12 +608,15 @@ Dhcpv4Srv::assignLease(const Pkt4Ptr& question, Pkt4Ptr& answer) {
     // allocation.
     bool fake_allocation = (question->getType() == DHCPDISCOVER);
 
+    CalloutHandlePtr callout_handle = getCalloutHandle(question);
+
     // Use allocation engine to pick a lease for this client. Allocation engine
     // will try to honour the hint, but it is just a hint - some other address
     // may be used instead. If fake_allocation is set to false, the lease will
     // be inserted into the LeaseMgr as well.
     Lease4Ptr lease = alloc_engine_->allocateAddress4(subnet, client_id, hwaddr,
-                                                      hint, fake_allocation);
+                                                      hint, fake_allocation,
+                                                      callout_handle);
 
     if (lease) {
         // We have a lease! Let's set it in the packet and send it back to