MdeModulePkg: Fix build error in the PXE driver.

Fix the build error introduced by 0a28d02d9fb5293757c507e592a4d0404a7ecf74.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Fu Siyuan <siyuan.fu@intel.com>
diff --git a/MdeModulePkg/Universal/Network/UefiPxeBcDxe/PxeBcSupport.c b/MdeModulePkg/Universal/Network/UefiPxeBcDxe/PxeBcSupport.c
index a20fdb7..0865ddd 100644
--- a/MdeModulePkg/Universal/Network/UefiPxeBcDxe/PxeBcSupport.c
+++ b/MdeModulePkg/Universal/Network/UefiPxeBcDxe/PxeBcSupport.c
@@ -79,7 +79,7 @@
 

   Udp4CfgData.ReceiveTimeout = PXEBC_DEFAULT_LIFETIME;

   Udp4CfgData.TypeOfService  = ToS;

-  Udp4CfgData.TimeToLive     = TTL;

+  Udp4CfgData.TimeToLive     = Ttl;

   Udp4CfgData.AllowDuplicatePort = TRUE;

 

   CopyMem (&Udp4CfgData.StationAddress, StationIp, sizeof (*StationIp));