firewire: ohci: correct signedness of a local variable

{

	struct fw_ohci *ohci =

		container_of(work, struct fw_ohci, bus_reset_work);

	int self_id_count, i, j, reg;

	int generation, new_generation;

	int self_id_count, generation, new_generation, i, j;

	u32 reg;

	unsigned long flags;

	void *free_rom = NULL;

	dma_addr_t free_rom_bus = 0;