Revert "fbdev: fb_pm2fb: Avoid potential divide by zero error"

This reverts commit 6577e903. It's a
duplicate of a commit that is already in this tree
(0f1174f4).

Signed-off-by: Ulrich Hecht <uli+cip@fpond.eu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>