Oops, 512x512 in 16 bit mode

--HG--
branch : SDL-1.2
extra : convert_revision : svn%3Ac70aab31-4412-0410-b14c-859654838e24/branches/SDL-1.2%402377

src/video/nds/SDL_ndsvideo.c

@@ -331,7 +331,7 @@ SDL_Surface *NDS_SetVideoMode(_THIS, SDL_Surface *current,
 	if(bpp==8)
 		current->pitch =1024;
 	else
-		current->pitch =1024*2;
+		current->pitch =512*2;
 
 	/* We're done */
 	return(current);