b43: allocate receive buffers big enough for max frame len + offset

Otherwise, skb_put inside of dma_rx can fail...

	https://bugzilla.kernel.org/show_bug.cgi?id=32042

Signed-off-by: John W. Linville <linville@tuxdriver.com>
Acked-by: Larry Finger <Larry.Finger@lwfinger.net>
Cc: stable@kernel.org
struct b43_dmadesc_generic *op64_idx2desc(struct b43_dmaring *ring,
					  int slot,
					  struct b43_dmadesc_meta **meta)
{
	struct b43_dmadesc64 *desc;

	*meta = &(ring->meta[slot]);
	desc = ring->descbase;
	desc = &(desc[slot]);

	return (struct b43_dmadesc_generic *)desc;
}

struct b43_dmadesc_generic *op64_idx2desc(struct b43_dmaring *ring,
					  int slot,
					  struct b43_dmadesc_meta **meta)
{
	struct b43_dmadesc64 *desc;

	*meta = &(ring->meta[slot]);
	desc = ring->descbase;
	desc = &(desc[slot]);

	return (struct b43_dmadesc_generic *)desc;
}
