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https://bugzilla.tianocore.org/show_bug.cgi?id=239 When the input path for API PathRemoveLastItem() is a root path like 'fs0:\', the API will return TRUE (indicating a directory or file was removed from the path) and modifies the path to 'fs0:'. In fact, there's no directory or file removed in the above case. This commit adds additional check to resolve this issue and modifies the API's description to make it more straightforward. Cc: Ruiyu Ni <ruiyu.ni@intel.com> Cc: Liming Gao <liming.gao@intel.com> Contributed-under: TianoCore Contribution Agreement 1.0 Signed-off-by: Hao Wu <hao.a.wu@intel.com> Reviewed-by: Ruiyu Ni <ruiyu.ni@intel.com>