ath6kl coding style

• Use ret to store return variables:

int ret;

ret = request_firmware(&fw_entry, filename, ar->dev);
if (ret)
        return ret;

• Use err_<action> for error path labels:

ret = ath6kl_hif_power_on(ar);
if (ret)
        return ret;

ret = ath6kl_configure_target(ar);
if (ret)
        goto err_power_off;

ret = ath6kl_init_upload(ar);
if (ret)
        goto err_cleanup_target;

return 0;

err_cleanup_scatter:
        ath6kl_cleanup_target(ar);
err_power_off:
        ath6kl_hif_power_off(ar);
return ret;

• Always document what lock/mutex/rcu actually protects.

• Name of symbols follow style ath6kl_<file>_name.