drm_fb_helper: Impossible to change video mode

Hi,

On drivers using drm_fb_helper's in fb_ops it is not possible to change
video mode, because of different var->pixclock evaluation:

int drm_fb_helper_check_var(struct fb_var_screeninfo *var,
			    struct fb_info *info)
{
[...]
	if (var->pixclock == -1 || !var->pixclock)
		return -EINVAL;
[...]

int drm_fb_helper_set_par(struct fb_info *info)
{
[...]
	if (var->pixclock != -1) {
		DRM_ERROR("PIXEL CLCOK SET\n");
		return -EINVAL;
	}
[...]

One of these evaluations will fail regardless of pixclock value.

P.S. check CLCOK spelling :)

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