elput: Remove useless call to eldbus_message_unref

If we are returning here due to a failure to create the eldbus
message, then there is no point in trying to free it as it is already
null.

@fix

src/lib/elput/elput_logind.c

@@ -41,7 +41,6 @@ _logind_device_pause_complete(Elput_Manager *em, uint32_t major, uint32_t minor)
    if (!msg)
      {
         ERR("Could not create method call for proxy");
-        eldbus_message_unref(msg);
         return;
      }