virtio-9p: use accessor to get thread_pool
The aio_context_new() function does not allocate a thread pool. This is deferred to the first call to the aio_get_thread_pool() accessor. It is hence forbidden to access the thread_pool field directly, as it may be NULL. The accessor *must* be used always. Fixes: ebac1202Reviewed-by: NMichael Tokarev <mjt@tls.msk.ru> Tested-by: NMichael Tokarev <mjt@tls.msk.ru> Cc: qemu-stable@nongnu.org Signed-off-by: NGreg Kurz <gkurz@linux.vnet.ibm.com>
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