[PATCH] libata: Fix interesting use of "extern" and also some bracketing

Signed-off-by: Alan Cox <alan@redhat.com>

Last of the set, just clean up some oddments. Assuming the whole set is
now ok then the remaining differences are the setup of PIO_0 at reset
and the ->data_xfer method.
Signed-off-by: Jeff Garzik <jeff@garzik.org>