video: fbdev: mb862xx: remove redundant assignment to pointer ptr

The pointer ptr is being assigned a value that is never read. The
pointer is being re-assigned later in a loop. The assignment is
redundant and can be removed.

Signed-off-by: Colin Ian King <colin.i.king@gmail.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Helge Deller <deller@gmx.de>