qcacld-3.0: Fix potential NULL reference in wlan_ipa_uc_loaded_handler

In function wlan_ipa_uc_loaded_handler,the qdf_dev is as return of
wlan_psoc_get_qdf_dev(),which maybe NULL,then NULL reference could
occur later.

Change-Id: I3c6d5af35934deef643cb600b1966c22769c71ed
CRs-Fixed: 2250977

ipa/core/src/wlan_ipa_core.c

@@ -2447,6 +2447,10 @@ static void wlan_ipa_uc_loaded_handler(struct wlan_ipa_priv *ipa_ctx)
 		return;
 	}
 
+	if (!qdf_dev) {
+		ipa_err("qdf_dev is null");
+		return;
+	}
 	/* Connect pipe */
 	status = wlan_ipa_wdi_setup(ipa_ctx, qdf_dev);
 	if (status) {