Fix undefined in format-test #1349
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When `MoveCtor` performs `check_move_buffer`, the buffer allocator becomes null, but then `MoveCtor` attempts to use it to allocate a dynamic buffer. This succeeds nevertheless because a typical `std::allocator<char>::allocate` does not use `this`, so it does not crash when `this` is null. Fixes fmtlib#1344
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When
MoveCtorperformscheck_move_buffer, the buffer allocator becomes null, but thenMoveCtorattempts to use it to allocate a dynamic buffer. This succeeds nevertheless because a typicalstd::allocator<char>::allocatedoes not usethis, so it does not crash whenthisis null.Fixes #1344