[PATCH] aio: Refactor to deduplicate shared and local completion callbacks

Hi,

I've observed that the functions `pgaio_io_call_complete_shared()` and` pgaio_io_call_complete_local()` contain nearly identical code,
with only minor differences in initialization and callback selection.
This code duplication was previously noted with an XXX comment.
I propose extracting the common logic into a new internal function `pgaio_io_call_complete_internal()`,
which uses a boolean parameter to distinguish between the two code paths.
What do you think of this approach?

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Regards,
Man Zeng
www.openhalo.org