Merge "msm: mdss: Fix NULL pointer deference in mdss_mdp_overlay_handle_vsync"

static void mdss_mdp_overlay_handle_vsync(struct mdss_mdp_ctl *ctl,

						ktime_t t)

{

	struct msm_fb_data_type *mfd = ctl->mfd;

	struct mdss_overlay_private *mdp5_data;

	struct msm_fb_data_type *mfd = NULL;

	struct mdss_overlay_private *mdp5_data = NULL;

	if (!ctl) {

		pr_err("ctl is NULL\n");

		return;

	}

	mfd = ctl->mfd;

	if (!mfd || !mfd->mdp.private1) {

		pr_warn("Invalid handle for vsync\n");

		return;

	}

	mdp5_data = mfd_to_mdp5_data(mfd);

	if (!mdp5_data) {

		pr_err("mdp5_data is NULL\n");

		return;

	}

	pr_debug("vsync on fb%d play_cnt=%d\n", mfd->index, ctl->play_cnt);

	mdp5_data->vsync_time = t;