libc++: remove unused variable in random_device::operator()() Reviewers: jvoung Subscribers: cfe-commits Differential Revision: http://reviews.llvm.org/D7416 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@228183 91177308-0d34-0410-b5e6-96231b3b80d8 
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