afs: Calculate lock extend timer from set/extend reply reception
Record the timestamp on the first reply DATA packet received in response to
a set- or extend-lock operation, then use this to calculate the time
remaining till the lock expires rather than using whatever time the
requesting process wakes up and finishes processing the operation as a
base.
Signed-off-by: NDavid Howells <dhowells@redhat.com>
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