drm/xe/display/xe_hdcp_gsc: Free arbiter on driver removal

Free arbiter allocated in intel_hdcp_gsc_init().

Fixes: 152f2df9 ("drm/xe/hdcp: Enable HDCP for XE")
Cc: Suraj Kandpal <suraj.kandpal@intel.com>
Cc: Arun R Murthy <arun.r.murthy@intel.com>
Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240708125918.23573-1-nirmoy.das@intel.comSigned-off-by: Nirmoy Das <nirmoy.das@intel.com>

drivers/gpu/drm/xe/display/xe_hdcp_gsc.c

@@ -160,12 +160,16 @@ void intel_hdcp_gsc_fini(struct xe_device *xe)
 {
 	struct intel_hdcp_gsc_message *hdcp_message =
 					xe->display.hdcp.hdcp_message;
+	struct i915_hdcp_arbiter *arb = xe->display.hdcp.arbiter;
 
-	if (!hdcp_message)
-		return;
+	if (hdcp_message) {
+		xe_bo_unpin_map_no_vm(hdcp_message->hdcp_bo);
+		kfree(hdcp_message);
+		xe->display.hdcp.hdcp_message = NULL;
+	}
 
-	xe_bo_unpin_map_no_vm(hdcp_message->hdcp_bo);
-	kfree(hdcp_message);
+	kfree(arb);
+	xe->display.hdcp.arbiter = NULL;
 }
 
 static int xe_gsc_send_sync(struct xe_device *xe,