firewire: Byteswap iso header so all headers are presented as be32.

	p = db + 1;

	end = p + header_length;

	while (p < end && i + ctx->base.header_size <= PAGE_SIZE) {

		memcpy(ctx->header + i, p + 4, ctx->base.header_size);

		/* The iso header is byteswapped to little endian by

		 * the controller, but the remaining header quadlets

		 * are big endian.  We want to present all the headers

		 * as big endian, so we have to swap the first

		 * quadlet. */

		*(u32 *) (ctx->header + i) = __swab32(*(u32 *) (p + 4));

		memcpy(ctx->header + i + 4, p + 8, ctx->base.header_size - 4);

		i += ctx->base.header_size;

		p += ctx->base.header_size + 4;

	}