Get rid of push_back in favor of emplace_back

Change-Id: I4a0096441ed725eb21e42eb9cc17a173929e3788
diff --git a/src/netconf_access.cpp b/src/netconf_access.cpp
index ecdece0..689b2b5 100644
--- a/src/netconf_access.cpp
+++ b/src/netconf_access.cpp
@@ -169,7 +169,7 @@
     for (auto it : set->data()) {
         if (it->schema()->nodetype() == LYS_LEAF) {
             libyang::Data_Node_Leaf_List leaf(it);
-            res.push_back(leaf.value_str());
+            res.emplace_back(leaf.value_str());
         }
     }
     return res;
@@ -210,7 +210,7 @@
             auto leafSchema = libyang::Schema_Node_Leaf{leafData.schema()};
             instanceRes.insert({ leafSchema.name(), leafValueFromValue(leafData.value(), leafSchema.type()->base())});
         }
-        res.push_back(instanceRes);
+        res.emplace_back(instanceRes);
     }
 
     return res;