Cleanup annoying compiler warnings

lib/farmbot/celery_script/ast/node/zero.ex

@@ -31,7 +31,7 @@ defmodule Farmbot.CeleryScript.AST.Node.Zero do
   @default_num_tries 20
   defp do_wait_for_pos(axis, env, tries \\ @default_num_tries)
 
-  defp do_wait_for_pos(axis, env, 0) do
+  defp do_wait_for_pos(_axis, env, 0) do
     # {:error, "Failed to set #{axis} location to 0", env}
     {:ok, env}
   end

lib/farmbot/farm_event/manager.ex

@@ -68,7 +68,7 @@ defmodule Farmbot.FarmEvent.Manager do
     {:noreply, %{state | timer: nil, checkup: checkup}}
   end
 
-  def handle_info({:DOWN, _, :process, _, {:success, new_state}}, old_state) do
+  def handle_info({:DOWN, _, :process, _, {:success, new_state}}, _old_state) do
     timer = Process.send_after(self(), :checkup, @checkup_time)
     {:noreply, %{new_state | timer: timer, checkup: nil}}
   end
@@ -79,7 +79,7 @@ defmodule Farmbot.FarmEvent.Manager do
     {:noreply, %{state | timer: timer, checkup: nil}}
   end
 
-  def async_checkup(manager, state) do
+  def async_checkup(_manager, state) do
     now = get_now()
     alias Farmbot.Repo.FarmEvent
     # maybe_farm_event_log "Rebuilding calendar."

lib/farmbot/logger/console.ex

@@ -52,7 +52,7 @@ defmodule Farmbot.Logger.Console do
     :ok
   end
 
-  defp maybe_log(%Farmbot.Log{module: module} = log) do
+  defp maybe_log(%Farmbot.Log{module: _module} = log) do
     # should_log = List.first(Module.split(module)) == "Farmbot"
     # if should_log do
     # credo:disable-for-next-line