Greentea Wifi testcase fixes

Replace 'TEST_PASS' with 'return'

Author: Veijo Pesonen

TESTS/network/wifi/wifi_connect_params_valid_secure.cpp

@@ -30,19 +30,19 @@ void wifi_connect_params_valid_secure(void)
     WiFiInterface *wifi = get_interface();
 
     if(wifi->connect(MBED_CONF_APP_WIFI_SECURE_SSID, MBED_CONF_APP_WIFI_PASSWORD, NSAPI_SECURITY_WPA2) == NSAPI_ERROR_OK) {
-        TEST_PASS();
+        return;
     }
 
     if(wifi->connect(MBED_CONF_APP_WIFI_SECURE_SSID, MBED_CONF_APP_WIFI_PASSWORD, NSAPI_SECURITY_WPA_WPA2) == NSAPI_ERROR_OK) {
-        TEST_PASS();
+        return;
     }
 
     if(wifi->connect(MBED_CONF_APP_WIFI_SECURE_SSID, MBED_CONF_APP_WIFI_PASSWORD, NSAPI_SECURITY_WPA) == NSAPI_ERROR_OK) {
-        TEST_PASS();
+        return;
     }
 
     if(wifi->connect(MBED_CONF_APP_WIFI_SECURE_SSID, MBED_CONF_APP_WIFI_PASSWORD, NSAPI_SECURITY_WEP) == NSAPI_ERROR_OK) {
-        TEST_PASS();
+        return;
     }
 
     TEST_FAIL();