[Patch] MdeModulePkg/DeviceManagerUiLib: Fix the network device MAC display issue

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

Network device tile (STR_FORM_NETWORK_DEVICE_TITLE) is dynamic adjusted
according the different MAC value. So, the string value shouldn't be treated
as a constant string (Network Device). Otherwise, the display will be
incorrect.

Reproduce: Device Manager->Network Device List, select to enter MAC, then to
press ESC back to previous page, then re-enter, found each enter/ESC operation,
the MAC address display +1.

Cc: Eric Dong <eric.dong@intel.com>
Cc: Ye Ting <ting.ye@intel.com>
Cc: Fu Siyuan <siyuan.fu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Wu Jiaxin <jiaxin.wu@intel.com>
---
 MdeModulePkg/Library/DeviceManagerUiLib/DeviceManager.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/MdeModulePkg/Library/DeviceManagerUiLib/DeviceManager.c b/MdeModulePkg/Library/DeviceManagerUiLib/DeviceManager.c
index 5098b70..8630ab0 100644
--- a/MdeModulePkg/Library/DeviceManagerUiLib/DeviceManager.c
+++ b/MdeModulePkg/Library/DeviceManagerUiLib/DeviceManager.c
@@ -538,17 +538,15 @@ CreateDeviceManagerForm(
 
   //
   // Update the network device form titile.
   //
   if (NextShowFormId == NETWORK_DEVICE_FORM_ID) {
-    String = HiiGetString (HiiHandle, STRING_TOKEN (STR_FORM_NETWORK_DEVICE_TITLE), NULL);
     NewStringLen = StrLen(mSelectedMacAddrString) * 2;
-    NewStringLen += (StrLen(String) + 2) * 2;
+    NewStringLen += (StrLen (L"Network Device") + 2) * 2;
     NewStringTitle = AllocatePool (NewStringLen);
-    UnicodeSPrint (NewStringTitle, NewStringLen, L"%s %s", String, mSelectedMacAddrString);
+    UnicodeSPrint (NewStringTitle, NewStringLen, L"Network Device %s", mSelectedMacAddrString);
     HiiSetString (HiiHandle, STRING_TOKEN (STR_FORM_NETWORK_DEVICE_TITLE), NewStringTitle, NULL);    
-    FreePool (String);
     FreePool (NewStringTitle);
   }
 
   //
   // Allocate space for creation of UpdateData Buffer
-- 
1.9.5.msysgit.1