wlan: Fix Static analysis error.

Fix Static analysis errors as below:
1) Handle return value in WLANDXE_StartLogTransfer and
   WDTS_openTransport
2) Removed dead code in wlan_hdd_cfg80211_set_ie
3) Limit check for rateIdx in hdd_mon_add_rx_radiotap_hdr
4) Null check for pHddCtx in hdd_rx_packet_monitor_cbk
5) Memory leak in __iw_setint_getnone,
   limHandleDelBssInReAssocContext and __limProcessSmeScanReq

Change-Id: I9dc0c630d62c06fb55e953f9506b04dbeff9bd51
CRs-Fixed: 919502
diff --git a/CORE/MAC/src/pe/lim/limProcessSmeReqMessages.c b/CORE/MAC/src/pe/lim/limProcessSmeReqMessages.c
index 09b0baa..209a837 100644
--- a/CORE/MAC/src/pe/lim/limProcessSmeReqMessages.c
+++ b/CORE/MAC/src/pe/lim/limProcessSmeReqMessages.c
@@ -1408,6 +1408,7 @@
                                         pScanReq->sessionId,
                                         pScanReq->transactionId);
                   }
+                  vos_mem_free(pMlmScanReq);
                   return;
               }
               pMlmScanReq->channelList.numChannels = (tANI_U8) cfg_len;