qcacld-3.0: Fix NULL pointer dereferencing in p2p TX MGMT

Fix dereferencing channel struct pointer without verifying the
validity.

CRs-Fixed: 1034743
Change-Id: I7a49467c3fdbe85c7255fcce7f135e53658eef63

core/hdd/src/wlan_hdd_p2p.c

@@ -1411,7 +1411,9 @@ int __wlan_hdd_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
 			home_ch = goAdapter->sessionCtx.ap.operatingChannel;
 	}
 
-	if (ieee80211_frequency_to_channel(chan->center_freq) == home_ch) {
+	if (chan &&
+	    (ieee80211_frequency_to_channel(chan->center_freq) ==
+	     home_ch)) {
 		/* if adapter is already on requested ch, no need for ROC */
 		wait = 0;
 		hddLog(LOG1,
@@ -1419,7 +1421,7 @@ int __wlan_hdd_mgmt_tx(struct wiphy *wiphy, struct wireless_dev *wdev,
 		goto send_frame;
 	}
 
-	if (offchan && wait) {
+	if (offchan && wait && chan) {
 		int status;
 		rem_on_channel_request_type_t req_type = OFF_CHANNEL_ACTION_TX;
 		/* In case of P2P Client mode if we are already */