n64cart: fix the dma address in n64cart_do_bvec

dma_map_bvec already takes bv_offset into account.

Fixes: 9b2a2bbbb4d0 ("block: Add n64 cart driver")
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Author: Christoph Hellwig

drivers/block/n64cart.c

@@ -74,7 +74,7 @@ static bool n64cart_do_bvec(struct device *dev, struct bio_vec *bv, u32 pos)
 
 	n64cart_wait_dma();
 
-	n64cart_write_reg(PI_DRAM_REG, dma_addr + bv->bv_offset);
+	n64cart_write_reg(PI_DRAM_REG, dma_addr);
 	n64cart_write_reg(PI_CART_REG, (bstart | CART_DOMAIN) & CART_MAX);
 	n64cart_write_reg(PI_WRITE_REG, bv->bv_len - 1);