BaseTools: fix LzmaCompress VS2013 make failure
BaseTools: fix LzmaCompress VS2013 make failure

when make BaseTools by VS2013, LzmaEnc.c report warning C4127:
conditional expression is constant, so this patch fix this issue.

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Yonghong Zhu <78d981fe33a016071af5222c56d5cf77f30fb0b2@intel.com>
Reviewed-by: Liming Gao <6480311aeeb4b006862f6d13ebabddc03f51e507@intel.com>

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