sound/oss/pss: set_io_base() always returns success, mark it void

[akpm@linux-foundation.org: coding-style fixes]
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>