Merge pull request ARMmbed#1629 from ARMmbed/cppcheck_fixes

Cppcheck fixes

Author: Jarkko Paso

source/MAC/IEEE802_15_4/mac_mcps_sap.c

@@ -154,7 +154,10 @@ void mcps_sap_data_req_handler(protocol_interface_rf_mac_setup_s *rf_mac_setup ,
 
 static bool mac_ie_vector_length_validate(ns_ie_iovec_t *ie_vector, uint16_t iov_length,  uint16_t *length_out)
 {
-    *length_out = 0;
+    if (length_out) {
+        *length_out = 0;
+    }
+
     if (!iov_length) {
         return true;
     }

source/Service_Libs/fhss/fhss_configuration_interface.c

@@ -90,7 +90,6 @@ int ns_fhss_delete(fhss_api_t *fhss_api)
         return -1;
     }
     ns_dyn_mem_free(fhss_api);
-    fhss_api = NULL;
     return 0;
 }
 

source/Service_Libs/fhss/fhss_ws.c

@@ -77,11 +77,9 @@ fhss_structure_t *fhss_ws_enable(fhss_api_t *fhss_api, const fhss_ws_configurati
 
 static int32_t fhss_ws_calc_bc_channel(fhss_structure_t *fhss_structure)
 {
-    int32_t next_channel;
-
-    if (fhss_structure->ws->fhss_configuration.ws_channel_function == WS_FIXED_CHANNEL) {
+    int32_t next_channel = fhss_structure->rx_channel;
 
-    } else if (fhss_structure->ws->fhss_configuration.ws_channel_function == WS_TR51CF) {
+    if (fhss_structure->ws->fhss_configuration.ws_channel_function == WS_TR51CF) {
         next_channel = tr51_get_bc_channel_index(fhss_structure->ws->bc_slot, fhss_structure->ws->fhss_configuration.bsi, fhss_structure->number_of_channels, NULL, 0);
         if (++fhss_structure->ws->bc_slot == fhss_structure->number_of_channels) {
             fhss_structure->ws->bc_slot = 0;