staging: rtl8188eu: core: rtw_wlan_util.c: Fix for NULL dereference

In rtw_check_bcn_info(), check the return value of kzalloc() before
dereferencing it, to avoid NULL pointer dereference.
Signed-off-by: Kumar Amit Mehta <gmate.amit@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/rtl8188eu/core/rtw_wlan_util.c

@@ -931,6 +931,8 @@ int rtw_check_bcn_info(struct adapter  *Adapter, u8 *pframe, u32 packet_len)
 	}
 
 	bssid = kzalloc(sizeof(struct wlan_bssid_ex), GFP_ATOMIC);
+	if (!bssid)
+		return _FAIL;
 
 	subtype = GetFrameSubType(pframe) >> 4;