staging: r8188eu: fix lines modified by DBG_88E cleanup

staging: r8188eu: fix lines modified by DBG_88E cleanup

A number of style problems were left behind by the DBG_88E cleanup:
(1) Empty if/else blocks.
(2) Parenthesised if/while statements containing only one line.
(3) Entire blocks which server zero purpose after removal of DBG_88E.
(4) Various warnings about whitespace, and constant comparison order.
(5) Use of __constant_htons instead when htons should be used.

Fix up these issues across the driver in any file touched by the
previous cleanup. Long line warnings will be addresses in a later
patch.

Signed-off-by: Phillip Potter <phil@philpotter.co.uk>
Link: https://lore.kernel.org/r/20220216010709.791-13-phil@philpotter.co.uk
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>