NetworkPkg: Update IScsiDxe to pass XCODE build

Fix the warning equality comparison with extraneous parentheses
[-Werror,-Wparentheses-equality].

Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Liang Vincent <vincent.liang@intel.com>
Reviewed-by: Jiaxin Wu <jiaxin.wu@intel.com>
(cherry picked from commit cf260a47be)

NetworkPkg/IScsiDxe/IScsiDhcp.c

@@ -266,7 +266,7 @@ IScsiDhcpSelectOffer (
     break;
   }
 
-  if ((Index == OptionCount)) {
+  if (Index == OptionCount) {
     Status = EFI_NOT_READY;
   }
 

NetworkPkg/IScsiDxe/IScsiExtScsiPassThru.c

@@ -1,7 +1,7 @@
 /** @file
   The implementation of EFI_EXT_SCSI_PASS_THRU_PROTOCOL.
 
-Copyright (c) 2004 - 2015, Intel Corporation. All rights reserved.<BR>
+Copyright (c) 2004 - 2017, 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
@@ -219,7 +219,7 @@ IScsiExtScsiPassThruBuildDevicePath (
   EFI_DEV_PATH                  *Node;
   UINTN                         DevPathNodeLen;
 
-  if ((DevicePath == NULL)) {
+  if (DevicePath == NULL) {
     return EFI_INVALID_PARAMETER;
   }