drm/msm/dp: Fix incorrect NULL check kbot warnings in DP driver

Fix an incorrect NULL check reported by kbot in the MSM DP driver

smatch warnings:
drivers/gpu/drm/msm/dp/dp_hpd.c:37 dp_hpd_connect()
error: we previously assumed 'hpd_priv->dp_cb' could be null
(see line 37)

Reported-by: kernel test robot <[e-mail]>
Reported-by: Dan Carpenter <[e-mail]>
Signed-off-by: Abhinav Kumar <[e-mail]>
Reviewed-by: Stephen Boyd <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Rob Clark <[e-mail]>

drivers/gpu/drm/msm/dp/dp_hpd.c

···
 
 	dp_usbpd->hpd_high = hpd;
 
-	if (!hpd_priv->dp_cb && !hpd_priv->dp_cb->configure
-				&& !hpd_priv->dp_cb->disconnect) {
+	if (!hpd_priv->dp_cb || !hpd_priv->dp_cb->configure
+				|| !hpd_priv->dp_cb->disconnect) {
 		pr_err("hpd dp_cb not initialized\n");
 		return -EINVAL;
 	}