Get probe instance
# DESCRIPTION
The function [io_uring_get_probe] returns an allocated
io_uring_probe structure to the caller. The caller is responsible for
freeing the structure with the function [io_uring_free_probe].
# NOTES
Earlier versions of the Linux kernel do not support probe. If the kernel
doesn't support probe, this function will return NULL.
# RETURN VALUE
On success it returns an allocated io_uring_probe structure, otherwise
it returns NULL.
# SEE ALSO
[io_uring_free_probe]