os: Initializing uninitialized members aio_info

os: Initializing uninitialized members aio_info

Fixes the coverity issue:

** 717332 Uninitialized pointer field
2. uninit_member: Non-static class member field iocb.data is not
initialized in this constructor nor in any functions that it calls.
4. uninit_member: Non-static class member field iocb.key is not
initialized in this constructor nor in any functions that it calls.
6. uninit_member: Non-static class member field iocb.__pad2 is not
initialized in this constructor nor in any functions that it calls.
8. uninit_member: Non-static class member field iocb.aio_lio_opcode
is not initialized in this constructor nor in any functions that it calls.
10. uninit_member: Non-static class member field iocb.aio_reqprio
is not initialized in this constructor nor in any functions that it calls.

CID 717332 (#1 of 1): Uninitialized pointer field (UNINIT_CTOR)
12. uninit_member: Non-static class member field iocb.aio_fildes is not
initialized in this constructor nor in any functions that it calls.

Signed-off-by: Amit Kumar amitkuma@redhat.com