[libcxx] r309881 - Rename a couple variables to eliminate a shadow warning. No functionality change

[Blitz Rakete via cfe-commits]

Instead of creating two variables, wouldn't it be better to just remove the
second definition and clear m_ec? You don't need to use both error codes
side by side, as the second usage of m_ec occurs after the first one is
finished. So you could remove the second definition and call clear() on it,
to reset it. I think that way is clearer then introducing one new variable,
no?
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