Some code to swap bytes wasn't using the swab16() function that the
kernel provides for this.  Make use of it, which results in more
efficient code.
Signed-off-by: NTrent Piepho <xyzzy@speakeasy.org>
Acked-by: NAntoine Jacquet <royale@zerezo.com>
Signed-off-by: NMauro Carvalho Chehab <mchehab@infradead.org>