staging: ath6kl: Remove A_SUCCESS macro

Remove obfuscating A_SUCCESS(foo) macro.
Just test for !foo instead.

Reformat a few macros that used A_SUCCESS for better readability.
Add do { foo } while (0) surrounds to those macros too.

Signed-off-by: Joe Perches <joe@perches.com>
Acked-by: Vipin Mehta <vipin.mehta@atheros.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>