Revert "drm/i915: Fix NULL ptr deref by checking new_crtc_state"

This reverts commit 1d5b09f.

Now that the root cause the missing crtc state has been fixed
we can get rid of the duct tape.

Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20250212164330.16891-3-ville.syrjala@linux.intel.com

Author: vsyrjala

drivers/gpu/drm/i915/display/intel_atomic_plane.c

@@ -1132,7 +1132,7 @@ intel_prepare_plane_fb(struct drm_plane *_plane,
 		 * This should only fail upon a hung GPU, in which case we
 		 * can safely continue.
 		 */
-		if (new_crtc_state && intel_crtc_needs_modeset(new_crtc_state)) {
+		if (intel_crtc_needs_modeset(new_crtc_state)) {
 			ret = add_dma_resv_fences(old_obj->resv,
 						  &new_plane_state->uapi);
 			if (ret < 0)