Staging: wlan-ng: hfa384x.h: Fix endianness warning for hfa384x_ps_user_count

The field in hfa384x_ps_user_count was defined as u16 but used as __le16
Changed type to __le16 for consistency

Signed-off-by: Manny Vindiola <mannyv@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>