staging: xillybus: Clarified the stop condition for a loop

Suggested-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NEli Billauer <eli.billauer@gmail.com>
Reviewed-by: NDan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: NGreg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/xillybus/xillybus_core.c

@@ -172,9 +172,9 @@ irqreturn_t xillybus_isr(int irq, void *data)
 		return IRQ_HANDLED;
 	}
 
-	buf_size = i;
+	buf_size = i + 2;
 
-	for (i = 0; i <= buf_size; i += 2) { /* Scan through messages */
+	for (i = 0; i < buf_size; i += 2) { /* Scan through messages */
 		opcode = (buf[i] >> 24) & 0xff;
 
 		msg_dir = buf[i] & 1;