Refine code to make it more safely.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Eric Dong <eric.dong@intel.com>
Reviewed-by: Siyuan Fu <siyuan.fu@intel.com>




git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@15589 6f19259b-4bc3-4df7-8a09-765794883524

NetworkPkg/UefiPxeBcDxe/PxeBcImpl.c

@@ -600,6 +600,7 @@ EfiPxeBcDiscover (
     if (EFI_ERROR (Status)) {
       goto ON_EXIT;
     }
+    ASSERT (NewCreatedInfo != NULL);
     Info = NewCreatedInfo;
   } else {
     //