block: fix bdrv_ioctl called from coroutine
When called from a coroutine, bdrv_ioctl must be asynchronous just like e.g. bdrv_flush. The code was incorrectly making it synchronous, fix it. Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com> Reviewed-by: NFam Zheng <famz@redhat.com> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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