[brcmfmac] Initialize scan result

Always initialize scan result so that fields not filled in are zeroed out.

WLAN-1135

TEST: Manually tested by replaying frames through scapy.
Change-Id: Ia18039d61cd7eca4673646f63cbdb13fcad9a16b
diff --git a/src/connectivity/wlan/drivers/third_party/broadcom/brcmfmac/cfg80211.cc b/src/connectivity/wlan/drivers/third_party/broadcom/brcmfmac/cfg80211.cc
index c5754bf..6820ac5 100644
--- a/src/connectivity/wlan/drivers/third_party/broadcom/brcmfmac/cfg80211.cc
+++ b/src/connectivity/wlan/drivers/third_party/broadcom/brcmfmac/cfg80211.cc
@@ -1421,7 +1421,7 @@
                                         uint16_t capability, uint16_t interval, uint8_t* ie,
                                         size_t ie_len, int16_t rssi_dbm) {
     struct net_device* ndev = wiphy_to_ndev(wiphy);
-    wlanif_scan_result_t result;
+    wlanif_scan_result_t result = {};
 
     if (!ndev->scan_busy) {
         return;