staging: rtl8712: fixed little endian problem

[ Upstream commit 502c80744fcac6b16f28699469c70db499fe2f69 ]

Fixed a sparse warning.
Using function le16_to_cpus() to avoid double assignment.

Signed-off-by: Jannik Becher <becher.jannik@gmail.com>
Tested-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>