staging:wlan-ng: cleanup hfa384x_ctlxout_callback

goto done is not required and actually having goto done does
jumps the program to end of the function and calls return.
instead call return directly

Signed-off-by: Devendra Naga <devendra.aaru@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>