Bluetooth: use DIV_ROUND_UP in suitable places in btmrvl_sdio

There are two places where DIV_ROUND_UP may be used. It makes code a bit
clearer.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

drivers/bluetooth/btmrvl_sdio.c

@@ -486,7 +486,7 @@ static int btmrvl_sdio_download_fw_w_helper(struct btmrvl_sdio_card *card)
 			if (firmwarelen - offset < txlen)
 				txlen = firmwarelen - offset;
 
-			tx_blocks = (txlen + blksz_dl - 1) / blksz_dl;
+			tx_blocks = DIV_ROUND_UP(txlen, blksz_dl);
 
 			memcpy(fwbuf, &firmware[offset], txlen);
 		}
@@ -873,7 +873,7 @@ static int btmrvl_sdio_host_to_card(struct btmrvl_private *priv,
 	}
 
 	blksz = SDIO_BLOCK_SIZE;
-	buf_block_len = (nb + blksz - 1) / blksz;
+	buf_block_len = DIV_ROUND_UP(nb, blksz);
 
 	sdio_claim_host(card->func);