Don't create state for the state_passer as a child

lib/einhorn.rb

@@ -129,6 +129,13 @@ def self.update_state(store, store_name, old_state)
         updated_state[:reloading_for_upgrade] = updated_state.delete(:reloading_for_preload_upgrade)
         message << "upgraded :reloading_for_preload_upgrade to :reloading_for_upgrade"
       end
+
+      # For a period, we created children entries for state_passers,
+      # but we don't want that (in particular, it probably died before
+      # we could setup our SIGCHLD handler
+      if updated_state[:children]
+        updated_state[:children].delete_if {|k, v| v[:type] == :state_passer}
+      end
     end
 
     default = store.default_state

lib/einhorn/command.rb

@@ -204,9 +204,6 @@ def self.reload
       fork do
         Einhorn::TransientState.whatami = :state_passer
         Einhorn::State.generation += 1
-        Einhorn::State.children[$$] = {
-          :type => :state_passer
-        }
         read.close
 
         begin