tests-mbed_hal-common_tickers_freq : correct overflowCounter value

Author: jeromecoutant

TESTS/mbed_hal/common_tickers_freq/main.cpp

@@ -69,8 +69,6 @@ void ticker_frequency_test()
     const uint32_t ticker_bits = intf->get_info()->bits;
     const uint32_t ticker_max = (1 << ticker_bits) - 1;
 
-    overflowCounter = 0;
-
     intf->init();
 
     /* Detect overflow for tickers with lower counters width. */
@@ -84,6 +82,8 @@ void ticker_frequency_test()
         expected_key = strcmp(_key, "base_time");
     } while (expected_key);
 
+    overflowCounter = 0;
+
     const uint32_t begin_ticks = intf->read();
 
     /* Assume that there was no overflow at this point - we are just after init. */