ata: pata_parport: Fix frpw module code indentation and style

Fix the header, indentation and coding style in the frpw pata parport
protocol module to suppress smatch warnings such as:

drivers/ata/pata_parport/frpw.c:234 frpw_test_proto() warn: inconsistent indenting

No functional changes.
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/oe-kbuild-all/202305061212.EPgEMLXl-lkp@intel.com/Signed-off-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>