libc++: remove unused variable in random_device::operator()()

Reviewers: jvoung

Subscribers: cfe-commits

Differential Revision: http://reviews.llvm.org/D7416

llvm-svn: 228183

libcxx/src/random.cpp

@@ -70,7 +70,6 @@ random_device::operator()()
 {
     unsigned r;
     size_t n = sizeof(r);
-    char* p = reinterpret_cast<char*>(&r);
     size_t bytes_written;
     int error = nacl_secure_random(&r, n, &bytes_written);
     if (error != 0)