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v3: * Add NULL string check. v2: * Define new STR_FORM_NETWORK_DEVICE_TITLE_HEAD for L" Network Device " instead of hard code in the code. 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> Reviewed-by: Ye Ting <ting.ye@intel.com> Reviewed-by: Fu Siyuan <siyuan.fu@intel.com> Reviewed-by: Eric Dong <eric.dong@intel.com>