wlan: Initialization of structure variable

Changes is required to avoid wapi key problem
due to use of uninitialized memory space.

CRs-fixed: 450642
Change-Id: Ibafc6fd2bafbb2f34ff9ad0711522d1ab3724797
(cherry picked from commit e748020fe48e316b063b4e7595dacde3753fdd90)
diff --git a/CORE/HDD/src/wlan_hdd_cfg80211.c b/CORE/HDD/src/wlan_hdd_cfg80211.c
index a7824ab..7076e29 100755
--- a/CORE/HDD/src/wlan_hdd_cfg80211.c
+++ b/CORE/HDD/src/wlan_hdd_cfg80211.c
@@ -780,6 +780,7 @@
     hddLog(VOS_TRACE_LEVEL_INFO, "%s: device_mode = %d\n",
                                         __func__,pAdapter->device_mode);
 
+    vos_mem_zero(&setKey, sizeof(tCsrRoamSetKey));
     setKey.keyId = key_index; // Store Key ID
     setKey.encType  = eCSR_ENCRYPT_TYPE_WPI; // SET WAPI Encryption
     setKey.keyDirection = eSIR_TX_RX;  // Key Directionn both TX and RX