staging: wlan-ng: remove unnecessary 'out of memory' message

This patch fixes "Possible unnecessary 'out of memory' message"
checkpatch.pl warning in hfa384x_usb.c

Signed-off-by: Melike Yurtoglu <aysemelikeyurtoglu@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>