avr32/pata: avoid unnecessary memset (updated after comments)

Remove an explicit memset(.., 0, ...) to a variable allocated with
kzalloc (i.e. 'info').

Signed-off-by: Christophe Jaillet <christophe.jaillet@wanadoo.fr>
Acked-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com>
Signed-off-by: Jeff Garzik <jgarzik@redhat.com>