AioCtl Shared Memory size fix

[Madhukar .]

Hi Folks,

While reviewing AIO code, we found an issue with AioCtlShmemSize function.
The function was not accounting for io_handles which is used post shared
memory alloc in AioShmemInit. Please find a patch to account for
io_handles member of PgAioCtl.

The patch uses sizeof(PgAioCtl) instead of offsetof(PgAioCtl, io_handles)
in AioCtlShmemSize.

Thanks,
Madhukar

patch.diff
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