In function DebuggerDisplaySymbolAccrodingToAddress(), when variable 'CandidateAddress' (returned by EbdFindSymbolAddress function) equals (UINTN) -1, it also indicates that the symbol is not found at the given address. This commit adds this missing check. Cc: Jiewen Yao <jiewen.yao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Hao Wu <hao.a.wu@intel.com> Reviewed-by: Jiewen Yao <jiewen.yao@intel.com>