staging: ks7010: replace unsigned char type with u8

Variable 'byte' in ks7010_upload_firmware function is declared
as unsigned char and is only being used to read hardware
registers which are expected in sdio_read_byteb function as u8.
Change 'byte' variable type to u8 which is preferred.
Signed-off-by: Sergio Paracuellos <sergio.paracuellos@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/ks7010/ks7010_sdio.c

@@ -752,7 +752,7 @@ static int ks7010_upload_firmware(struct ks_sdio_card *card)
 	struct ks_wlan_private *priv = card->priv;
 	struct sdio_func *func = ks7010_to_func(priv);
 	unsigned int n;
-	unsigned char byte = 0;
+	u8 byte = 0;
 	int ret;
 	const struct firmware *fw_entry = NULL;