qcacmn: Fix Spectral KW issues

Add null pointer checks in Spectral component

Change-Id: I42eb678f2d90d38c3c8afee8c010970783e66f52
CRs-Fixed: 2206406

spectral/dispatcher/src/wlan_spectral_utils_api.c

@@ -176,8 +176,10 @@ wlan_register_wmi_spectral_cmd_ops(struct wlan_objmgr_pdev *pdev,
 {
 	struct spectral_context *sc;
 
-	if (!pdev)
+	if (!pdev) {
 		spectral_err("PDEV is NULL!");
+		return;
+	}
 
 	sc = spectral_get_spectral_ctx_from_pdev(pdev);
 	if (!sc) {