pegasus: Use heap buffers for all register access

Allocating USB buffers on the stack is not portable, and no longer
works on x86_64 (with VMAP_STACK enabled as per default).

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
References: https://bugs.debian.org/852556
Reported-by: Lisandro Damián Nicanor Pérez Meyer <lisandro@debian.org>
Tested-by: Lisandro Damián Nicanor Pérez Meyer <lisandro@debian.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: David S. Miller <davem@davemloft.net>
static inline void get_node_id(pegasus_t *pegasus, __u8 *id)
{
	int i;
	__u16 w16;

	for (i = 0; i < 3; i++) {
		read_eprom_word(pegasus, i, &w16);
		((__le16 *) id)[i] = cpu_to_le16(w16);
	}
}

static inline void get_node_id(pegasus_t *pegasus, __u8 *id)
{
	int i;
	__u16 w16;

	for (i = 0; i < 3; i++) {
		read_eprom_word(pegasus, i, &w16);
		((__le16 *) id)[i] = cpu_to_le16(w16);
	}
}
