staging: rtl8723au: fix some confusing indenting

The break and the "unknown++" are at the same indent level so my static
checker complains.  The if statement should be indented more.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>