Add missing error checks for emac power up.

Author: cypress-midd

features/netsocket/emac-drivers/TARGET_Cypress/COMPONENT_WHD/interface/WhdSTAInterface.cpp

@@ -250,7 +250,9 @@ nsapi_error_t WhdSTAInterface::connect()
 
     // initialize wiced, this is noop if already init
     if (!_whd_emac.powered_up) {
-        _whd_emac.power_up();
+        if(!_whd_emac.power_up()) {
+            return NSAPI_ERROR_DEVICE_ERROR;
+        }
     }
 
     res = whd_management_set_event_handler(_whd_emac.ifp, sta_link_change_events,
@@ -322,7 +324,9 @@ nsapi_error_t WhdSTAInterface::connect()
 void WhdSTAInterface::wifi_on()
 {
     if (!_whd_emac.powered_up) {
-        _whd_emac.power_up();
+        if(!_whd_emac.power_up()) {
+            CY_ASSERT(false);
+        }
     }
 }
 
@@ -384,11 +388,14 @@ int8_t WhdSTAInterface::get_rssi()
 
     // initialize wiced, this is noop if already init
     if (!_whd_emac.powered_up) {
-        _whd_emac.power_up();
+        if(!_whd_emac.power_up()) {
+            CY_ASSERT(false);
+        }
     }
 
     res = (whd_result_t)whd_wifi_get_rssi(_whd_emac.ifp, &rssi);
     if (res != 0) {
+        CY_ASSERT(false);
         return 0;
     }
 
@@ -463,7 +470,9 @@ int WhdSTAInterface::internal_scan(WiFiAccessPoint *aps, unsigned count, scan_re
 
     // initialize wiced, this is noop if already init
     if (!_whd_emac.powered_up) {
-        _whd_emac.power_up();
+        if(!_whd_emac.power_up()) {
+            return NSAPI_ERROR_DEVICE_ERROR;
+        }
     }
 
     interal_scan_data.sema = new Semaphore();
@@ -476,7 +485,6 @@ int WhdSTAInterface::internal_scan(WiFiAccessPoint *aps, unsigned count, scan_re
     whd_result_t whd_res;
     int res;
 
-
     whd_res = (whd_result_t)whd_wifi_scan(_whd_emac.ifp, WHD_SCAN_TYPE_ACTIVE, WHD_BSS_TYPE_ANY,
                                           NULL, NULL, NULL, NULL, whd_scan_handler, &internal_scan_result, &interal_scan_data);
     if (whd_res != WHD_SUCCESS) {