staging: rtl8723au: Corrections in the coding style

Some corrections were made to the code in order to conform to the
Kernel Coding Style.

Jes: Fix build problem

Signed-off-by: Raphael Silva <rapphil@gmail.com>
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>