timer test: raise tolerance at max trigger count

Timing itself costs time. Thus, the stressfull timeout phase of the
test is not exactly as long as set but a little bit longer. This is why the
fast timeouts are able to trigger more often than they are expected to
(the timer has a static timeout-rate limit). Normally we consider this effect
through an error tolerance of 10%. But at least on foc x86_32 (PIT with very
low max timeout), timing is so expensive that 10% is not enough. We have to
raise it to 11%.

repos/os/src/test/timer/main.cc

@@ -79,7 +79,7 @@ struct Stress_test
 		enum { DURATION_US         = DURATION_SEC * 1000 * 1000 };
 		enum { MIN_TIMER_PERIOD_US = 1000 };
 		enum { MAX_CNT_BASE        = DURATION_US / MIN_TIMER_PERIOD_US };
-		enum { MAX_CNT_TOLERANCE   = MAX_CNT_BASE / 10 };
+		enum { MAX_CNT_TOLERANCE   = MAX_CNT_BASE / 9 };
 		enum { MAX_CNT             = MAX_CNT_BASE + MAX_CNT_TOLERANCE };
 		enum { MIN_CNT             = DURATION_US / MAX_SLV_PERIOD_US / 2 };