staging: ozwpan: Fix hrtimer wreckage

oz_timer_add() modifies the expiry value of an active timer, which
results in data corruption.

Use hrtimer_start() and remove the silly conditional.

While at it use the proper helper function to convert milliseconds to
ktime.

Signed-off-by: Thomas Gleixner <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Shigekatsu Tateno <[email protected]>
Acked-by: Greg Kroah-Hartman <[email protected]>
Cc: [email protected]
Link: http://lkml.kernel.org/r/[email protected]

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