Revert unrelated part of "drm: simplify the locking in the GETCRTC ioctl"

v2 of the commit 2c77bb29d398 ("drm: simplify the locking in the GETCRTC ioctl")
accidentally introduced a unrelated change in intel_display.c, revert the
unrelated change.

Signed-off-by: Maarten Lankhorst <[e-mail]>
Fixes: 2c77bb29d398 ("drm: simplify the locking in the GETCRTC ioctl")
Reported-by: Dhinakaran Pandiyan <[e-mail]>
Reviewed-by: Dhinakaran Pandiyan <[e-mail]>
Signed-off-by: Daniel Vetter <[e-mail]>
Link: http://patchwork.freedesktop.org/patch/msgid/[e-mail]

drivers/gpu/drm/i915/intel_display.c

···
 	ret = drm_atomic_helper_check_modeset(dev, state);
 	if (ret)
 		return ret;
-	/* enocder->atomic_check might upgrade some crtc to a full modeset */
-	ret = drm_atomic_helper_check_modeset(dev, state);
-	if (ret)
-		return ret;
-
 
 	for_each_oldnew_crtc_in_state(state, crtc, old_crtc_state, crtc_state, i) {
 		struct intel_crtc_state *pipe_config =