disp: msm: sde: fix null dereference in drm_atomic_get_property

Add changes to fix the null dereference in
drm_atomic_get_property caused by connector->state
being NULL. This change allows the drm_mode_config_reset
operation to happen before drm_dev_register to avoid this.
In current scenario, connector->state->crtc is being
accessed due to call to drm_mode_getconnector ioctl with
the drm_mode_config_reset operation pending.

Change-Id: I374d9485819fad85100d1837f4ae22fc2a3ccc40
Signed-off-by: Jayaprakash <jmadiset@codeaurora.org>

msm/msm_drv.c

@@ -846,13 +846,13 @@ static int msm_drm_component_init(struct device *dev)
 		}
 	}
 
+	drm_mode_config_reset(ddev);
+
 	ret = drm_dev_register(ddev, 0);
 	if (ret)
 		goto fail;
 	priv->registered = true;
 
-	drm_mode_config_reset(ddev);
-
 	if (kms && kms->funcs && kms->funcs->cont_splash_config) {
 		ret = kms->funcs->cont_splash_config(kms, NULL);
 		if (ret) {