block: clean up I/O throttling wait_time code
The wait_time variable is in seconds. Reflect this in a comment and use NANOSECONDS_PER_SECOND instead of BLOCK_IO_SLICE_TIME * 10 (which happens to have the right value). Signed-off-by: NStefan Hajnoczi <stefanha@redhat.com> Tested-By: NBenoit Canet <benoit@irqsave.net> Signed-off-by: NKevin Wolf <kwolf@redhat.com>
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