[C++] Memory access out of bounds in arrow-1.0.0

[luffy-zh]

Describe the bug, including details regarding any error messages, version, and platform.

Memory access is out of bounds at line array_nested.cc:78. There is no need to clear the bits of the final offset.

Component(s)

C++

[westonpace]

This was fixed in #9801

We may patch the current release but we don't typically backport fixes to older releases.

[kou]

Thanks for the report but I close this as duplicate of #27902.