rpcrt4: Increment the call id field of the request header.

dlls/rpcrt4/rpc_binding.h

@@ -37,6 +37,7 @@ typedef struct _RpcConnection
   USHORT MaxTransmissionSize;
   /* The active interface bound to server. */
   RPC_SYNTAX_IDENTIFIER ActiveInterface;
+  USHORT NextCallId;
 
   /* authentication */
   CtxtHandle ctx;

dlls/rpcrt4/rpc_message.c

@@ -666,6 +666,7 @@ RPC_STATUS WINAPI I_RpcSend(PRPC_MESSAGE pMsg)
     hdr = RPCRT4_BuildRequestHeader(pMsg->DataRepresentation,
                                     pMsg->BufferLength, pMsg->ProcNum,
                                     &bind->ObjectUuid);
+    hdr->common.call_id = conn->NextCallId++;
   }
 
   status = RPCRT4_Send(conn, hdr, pMsg->Buffer, pMsg->BufferLength);

dlls/rpcrt4/rpc_transport.c

@@ -451,6 +451,7 @@ RPC_STATUS RPCRT4_CreateConnection(RpcConnection** Connection, BOOL server, LPCS
   NewConnection->Endpoint = RPCRT4_strdupA(Endpoint);
   NewConnection->Used = Binding;
   NewConnection->MaxTransmissionSize = RPC_MAX_PACKET_SIZE;
+  NewConnection->NextCallId = 1;
 
   TRACE("connection: %p\n", NewConnection);
   *Connection = NewConnection;