[PATCH v3 3/3] NetworkPkg/DnsDxe: Remove unnecessary NULL pointer check.

[Jiaxin Wu <Jiaxin.wu@intel.com>]

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=1469

Since the value of ItemCache4/ItemCache6 is retrieved from the list
Entry, it can't be the NULL pointer, so just remove the unnecessary
check.

Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Cc: Wu Hao A <hao.a.wu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Wu Jiaxin <jiaxin.wu@intel.com>
---
 NetworkPkg/DnsDxe/DnsDriver.c | 22 +++++++++-------------
 1 file changed, 9 insertions(+), 13 deletions(-)

diff --git a/NetworkPkg/DnsDxe/DnsDriver.c b/NetworkPkg/DnsDxe/DnsDriver.c
index b74f5ba18e..6a4214caea 100644
--- a/NetworkPkg/DnsDxe/DnsDriver.c
+++ b/NetworkPkg/DnsDxe/DnsDriver.c
@@ -1,9 +1,9 @@
 /** @file
 The driver binding and service binding protocol for DnsDxe driver.
 
-Copyright (c) 2015 - 2018, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2015 - 2019, Intel Corporation. All rights reserved.<BR>
 This program and the accompanying materials
 are licensed and made available under the terms and conditions of the BSD License
 which accompanies this distribution.  The full text of the license may be found at
 http://opensource.org/licenses/bsd-license.php
 
@@ -374,40 +374,36 @@ DnsUnload (
       gBS->CloseEvent (mDriverData->Timer);
     }
 
     while (!IsListEmpty (&mDriverData->Dns4CacheList)) {
       Entry = NetListRemoveHead (&mDriverData->Dns4CacheList);
+      ASSERT (Entry != NULL);
       ItemCache4 = NET_LIST_USER_STRUCT (Entry, DNS4_CACHE, AllCacheLink);
-      if (ItemCache4->DnsCache.HostName != NULL) {
-        FreePool (ItemCache4->DnsCache.HostName);
-      }
-      if (ItemCache4->DnsCache.IpAddress != NULL) {
-        FreePool (ItemCache4->DnsCache.IpAddress);
-      }
+      FreePool (ItemCache4->DnsCache.HostName);
+      FreePool (ItemCache4->DnsCache.IpAddress);
       FreePool (ItemCache4);
     }
 
     while (!IsListEmpty (&mDriverData->Dns4ServerList)) {
       Entry = NetListRemoveHead (&mDriverData->Dns4ServerList);
+      ASSERT (Entry != NULL);
       ItemServerIp4 = NET_LIST_USER_STRUCT (Entry, DNS4_SERVER_IP, AllServerLink);
       FreePool (ItemServerIp4);
     }
 
     while (!IsListEmpty (&mDriverData->Dns6CacheList)) {
       Entry = NetListRemoveHead (&mDriverData->Dns6CacheList);
+      ASSERT (Entry != NULL);
       ItemCache6 = NET_LIST_USER_STRUCT (Entry, DNS6_CACHE, AllCacheLink);
-      if (ItemCache6->DnsCache.HostName != NULL) {
-        FreePool (ItemCache6->DnsCache.HostName);
-      }
-      if (ItemCache6->DnsCache.IpAddress != NULL) {
-        FreePool (ItemCache6->DnsCache.IpAddress);
-      }
+      FreePool (ItemCache6->DnsCache.HostName);
+      FreePool (ItemCache6->DnsCache.IpAddress);
       FreePool (ItemCache6);
     }
 
     while (!IsListEmpty (&mDriverData->Dns6ServerList)) {
       Entry = NetListRemoveHead (&mDriverData->Dns6ServerList);
+      ASSERT (Entry != NULL);
       ItemServerIp6 = NET_LIST_USER_STRUCT (Entry, DNS6_SERVER_IP, AllServerLink);
       FreePool (ItemServerIp6);
     }
 
     FreePool (mDriverData);
-- 
2.17.1.windows.2