CLI: squash a Dialyzer warning

Co-authored-by: Michael Davis <mcarsondavis@gmail.com>

deps/rabbitmq_cli/lib/rabbitmqctl.ex

@@ -28,7 +28,7 @@ defmodule RabbitMQCtl do
   def main(["--auto-complete" | []]) do
     # silence Erlang/OTP's standard library warnings, it's acceptable for CLI tools,
     # see rabbitmq/rabbitmq-server#8912
-    :logger.set_primary_config(:level, :error)
+    _ = :logger.set_primary_config(:level, :error)
 
     handle_shutdown(:ok)
   end