Merge pull request ARMmbed#2152 from ARMmbed/fhss_coverity_fix

fhss_ws: Coverity fixes

Author: Jarkko Paso

source/Service_Libs/fhss/fhss_ws.c

@@ -86,7 +86,7 @@ static bool fhss_ws_check_tx_allowed(fhss_structure_t *fhss_structure);
 static uint32_t fhss_set_txrx_slot_length(fhss_structure_t *fhss_structure);
 
 // This function supports rounding up
-static int32_t divide_integer(int64_t dividend, int32_t divisor)
+static int64_t divide_integer(int64_t dividend, int32_t divisor)
 {
     if (dividend < 0) {
         return (dividend - divisor / 2) / divisor;
@@ -867,9 +867,9 @@ int fhss_ws_set_parent(fhss_structure_t *fhss_structure, const uint8_t eui64[8],
                 drift_per_ms_tmp = -MAX_DRIFT_COMPENSATION_STEP;
             }
             fhss_structure->ws->drift_per_millisecond_ns += drift_per_ms_tmp;
-            fhss_stats_update(fhss_structure, STATS_FHSS_DRIFT_COMP, NS_TO_US(fhss_structure->ws->drift_per_millisecond_ns * bc_timing_info->broadcast_dwell_interval));
+            fhss_stats_update(fhss_structure, STATS_FHSS_DRIFT_COMP, NS_TO_US((int64_t)(fhss_structure->ws->drift_per_millisecond_ns * bc_timing_info->broadcast_dwell_interval)));
         }
-        tr_debug("synch to parent: %s, drift: %"PRIi32"ms in %"PRIu32" seconds, compensation: %"PRIi32"ns per ms", trace_array(eui64, 8), true_bc_interval_offset - own_bc_interval_offset + ((int32_t)(fhss_structure->ws->bc_slot - own_bc_slot) * bc_timing_info->broadcast_interval), US_TO_S(time_since_last_synch_us), fhss_structure->ws->drift_per_millisecond_ns);
+        tr_debug("synch to parent: %s, drift: %"PRIi32"ms in %"PRIu64" seconds, compensation: %"PRIi32"ns per ms", trace_array(eui64, 8), true_bc_interval_offset - own_bc_interval_offset + ((int32_t)(fhss_structure->ws->bc_slot - own_bc_slot) * bc_timing_info->broadcast_interval), US_TO_S(time_since_last_synch_us), fhss_structure->ws->drift_per_millisecond_ns);
     } else {
         //IOTTHD-3571 temporary debug traces
         tr_debug("Do not compensate");