fbdev: unicore32: use display information in info not in var for panning

We must not use any information in the passed var besides xoffset,
yoffset and vmode as otherwise applications might abuse it.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Cc: Guan Xuetao <redacted>
---
 drivers/video/fb-puv3.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/video/fb-puv3.c b/drivers/video/fb-puv3.c
index 27f2c57..60a787f 100644
--- a/drivers/video/fb-puv3.c
+++ b/drivers/video/fb-puv3.c

@@ -624,8 +624,8 @@ static int unifb_pan_display(struct fb_var_screeninfo *var,
 		    || var->xoffset)
 			return -EINVAL;
 	} else {
-		if (var->xoffset + var->xres > info->var.xres_virtual ||
-		    var->yoffset + var->yres > info->var.yres_virtual)
+		if (var->xoffset + info->var.xres > info->var.xres_virtual ||
+		    var->yoffset + info->var.yres > info->var.yres_virtual)
 			return -EINVAL;
 	}
 	info->var.xoffset = var->xoffset;