char/pcmcia: add some error checking in scr24x_read()

The "ret = " assignment seems to have accidentally been left off.

Fixes: f2ed287bcc90 ("char/pcmcia: add scr24x_cs chip card interface driver")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/char/pcmcia/scr24x_cs.c

@@ -158,7 +158,7 @@ static ssize_t scr24x_read(struct file *filp, char __user *buf, size_t count,
 		ret = -EIO;
 		goto out;
 	}
-	read_chunk(dev, CCID_HEADER_SIZE, len);
+	ret = read_chunk(dev, CCID_HEADER_SIZE, len);
 	if (ret < 0)
 		goto out;