BaseTools/GenFds: Remove redundant GetRealFileLine call

BaseTools/GenFds: Remove redundant GetRealFileLine call

The EvaluateConditional function should not call GetRealFileLine
because this is already done in Warning init and only needs to be
calculated in the event of a parsing failure. This fix stops
InsertedLines from being subtracted twice during error handling.

Cc: Liming Gao <liming.gao@intel.com>
Cc: Yonghong Zhu <yonghong.zhu@intel.com>
Contributed-under: TianoCore Contribution Agreement 1.1
Signed-off-by: Zurcher, Christopher J <christopher.j.zurcher@intel.com>
Reviewed-by: Yonghong Zhu <yonghong.zhu@intel.com>