pm2fb: Reset transparency settings

From: Krzysztof Helt < [email protected]>

This patch resets transparency settings when depth changes. Otherwise the 16 and 24-bit modes work incorrectly after switching from 32-bit mode.

---
This is a patch against 2.6.21 kernel.

----------------------------------------------------
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@@ -645,6 +656,8 @@ static int pm2fb_check_var(struct fb_var
 		return -EINVAL;
 	}
 
+	var->transp.offset = 0;
+	var->transp.length = 0;
 	switch(var->bits_per_pixel) {
 	case 8:
 		var->red.length = var->green.length = var->blue.length = 8;

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