drivers/lcd/pcf8574: driver lock should in pairs
@@ -1064,6 +1064,7 @@ static int pcf8574_lcd_open(FAR struct file *filep)
nxmutex_lock(&priv->lock);
if (priv->refs == MAX_OPENCNT)
{
+ nxmutex_unlock(&priv->lock);
return -EMFILE;
}
else
