timer: fix stress test on multiple runs
timer: fix stress test on multiple runs

Fix timer stress test to succeed on multiple runs.

Signed-off-by: Robert Sanford <8222414833f2c24db1670abff4ee4b90c033e566@gmail.com>
Acked-by: Olivier Matz <dfcc1510895413197abb4336e39bb0a3906cba71@6wind.com>

phermansson/dpdk,phermansson/dpdk,phermansson/dpdk,phermansson/dpdk