tgafb: Fix copying overlapping areas

 The direction of copying in the copyarea functions is
selected 
incorrectly, resulting in corruption.  This is a fix.

Signed-off-by: Maciej W. Rozycki <macrolinux-mips.org>
---

 It looks like these functions are not used by the console
code as image 
blitting is preferred for scrolling and hence the bug has
escaped 
unnoticed for so long.  Still it is not an excuse for these
functions to 
be wrong.

 Please apply.

  Maciej

patch-mips-2.6.18-20060920-tgafb-copyarea-1
diff -up --recursive --new-file
linux-mips-2.6.18-20060920.macro/drivers/video/tgafb.c
linux-mips-2.6.18-20060920/drivers/video/tgafb.c
---
linux-mips-2.6.18-20060920.macro/drivers/video/tgafb.c	2006-
09-20 20:50:52.000000000 +0000
+++
linux-mips-2.6.18-20060920/drivers/video/tgafb.c	2006-12-12
05:15:28.000000000 +0000
 -919,7
+919,7  copyarea_line_8bpp(struct fb_info *info,
 
 	n64 = (height * width) / 64;
 
-	if (dy < sy) {
+	if (sy < dy) {
 		spos = (sy + height) * width;
 		dpos = (dy + height) * width;
 
 -967,7
+967,7  copyarea_line_32bpp(struct fb_info *info
 
 	n16 = (height * width) / 16;
 
-	if (dy < sy) {
+	if (sy < dy) {
 		src = tga_fb + (sy + height) * width * 4;
 		dst = tga_fb + (dy + height) * width * 4;
 

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