1. Fix buffer overflow bugs in SNP, MNP and IP6 driver.

2. Fix GCC build fail issue in DxeNetLib.

Signed-off-by: Fu Siyuan <siyuan.fu@intel.com>
Reviewed-by: Ye Ting <ting.ye@intel.com>
Reviewed-by: Ouyang Qian <qian.ouyang@intel.com>

git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@14017 6f19259b-4bc3-4df7-8a09-765794883524

NetworkPkg/Ip6Dxe/ComponentName.c

@@ -280,7 +280,7 @@ UpdateName (
     }
     UnicodeSPrint (
       HandleName + Offset,
-      sizeof(HandleName) - Offset,
+      sizeof(HandleName) - Offset * sizeof (CHAR16),
       L"DestinationAddress=%s)",
       Address
       );