epee: check some error return values

contrib/epee/include/storages/levin_abstract_invoke2.h

@@ -60,8 +60,7 @@ namespace epee
         LOG_ERROR("Failed to load_from_binary on command " << command);
         return false;
       }
-      result_struct.load(stg_ret);
-      return true;
+      return result_struct.load(stg_ret);
     }
 
     template<class t_arg, class t_transport>
@@ -105,9 +104,7 @@ namespace epee
         LOG_ERROR("Failed to load_from_binary on command " << command);
         return false;
       }
-      result_struct.load(stg_ret);
-
-      return true;
+      return result_struct.load(stg_ret);
     }
 
     template<class t_result, class t_arg, class callback_t, class t_transport>
@@ -133,7 +130,12 @@ namespace epee
           cb(LEVIN_ERROR_FORMAT, result_struct, context);
           return false;
         }
-        result_struct.load(stg_ret);
+        if (!result_struct.load(stg_ret))
+        {
+          LOG_ERROR("Failed to load result struct on command " << command);
+          cb(LEVIN_ERROR_FORMAT, result_struct, context);
+          return false;
+        }
         cb(code, result_struct, context);
         return true;
       }, inv_timeout);
@@ -176,7 +178,11 @@ namespace epee
       boost::value_initialized<t_in_type> in_struct;
       boost::value_initialized<t_out_type> out_struct;
 
-      static_cast<t_in_type&>(in_struct).load(strg);
+      if (!static_cast<t_in_type&>(in_struct).load(strg))
+      {
+        LOG_ERROR("Failed to load in_struct in command " << command);
+        return -1;
+      }
       int res = cb(command, static_cast<t_in_type&>(in_struct), static_cast<t_out_type&>(out_struct), context);
       serialization::portable_storage strg_out;
       static_cast<t_out_type&>(out_struct).store(strg_out);
@@ -200,7 +206,11 @@ namespace epee
         return -1;
       }
       boost::value_initialized<t_in_type> in_struct;
-      static_cast<t_in_type&>(in_struct).load(strg);
+      if (!static_cast<t_in_type&>(in_struct).load(strg))
+      {
+        LOG_ERROR("Failed to load in_struct in notify " << command);
+        return -1;
+      }
       return cb(command, in_struct, context);
     }