libperfmgr: Remove request when returning 0ms

There is a small chance a request expire time is less than 1ms. In this
case, the request will be removed.

Test: libperfmgr_test

(cherry picked from commit 09fbfae2d8c3a9d2d071bbd8a29d3ffd46e0f13d)

Change-Id: I1928be09e40302f6aa949dab920cd6aa08dac014
1 file changed