Cellular: Fix cellular network unit test

Author: Mirela Chirica

UNITTESTS/features/cellular/framework/AT/at_cellularnetwork/at_cellularnetworktest.cpp

@@ -227,9 +227,8 @@ TEST_F(TestAT_CellularNetwork, test_AT_CellularNetwork_activate_context)
     ATHandler_stub::resp_stop_success_count = 2;
     ATHandler_stub::nsapi_error_value = NSAPI_ERROR_OK;
     ATHandler_stub::bool_value = false;
-    EXPECT_TRUE(NSAPI_ERROR_OK == cn.set_credentials("apn", CellularNetwork::CHAP, "user", "passwd"));
-    EXPECT_TRUE(NSAPI_ERROR_AUTH_FAILURE == cn.activate_context());
-
+    EXPECT_TRUE(NSAPI_ERROR_OK == my_cn.set_credentials("apn", CellularNetwork::CHAP, "user", "passwd"));
+    EXPECT_TRUE(NSAPI_ERROR_AUTH_FAILURE == my_cn.activate_context());
 
     // get_context return true and new context created, also do_user_authentication called with success.
     // Now there is stack.

features/cellular/framework/API/CellularNetwork.h

@@ -150,6 +150,9 @@ class CellularNetwork : public NetworkInterface {
             op_status = Unknown;
             op_rat = RAT_UNKNOWN;
             next = NULL;
+            op_long[0] = NULL;
+            op_short[0] = NULL;
+            op_num[0] = NULL;
         }
     };
 

features/cellular/framework/AT/AT_CellularNetwork.cpp

@@ -316,9 +316,10 @@ nsapi_error_t AT_CellularNetwork::activate_context()
 
     if (!_is_context_active) {
         // authenticate before activating or modifying context
-        if (do_user_authentication() != NSAPI_ERROR_OK) {
+        nsapi_error_t err = do_user_authentication();
+        if (err != NSAPI_ERROR_OK) {
             tr_error("Cellular authentication failed!");
-            return _at.unlock_return_error();
+            return err;
         }
 
         tr_info("Activate PDP context %d", _cid);