Iemgr: fix bug when loading aliases due to unsorted elements, change colliding error code

Author: sedmicha

src/iemgr/iemgr.cpp

@@ -279,6 +279,8 @@ dir_read(fds_iemgr_t* mgr, const char* path, fds_xml_t* parser, const string& na
         }
     }
 
+    mgr_sort(mgr);
+
     int rc;
 
     rc = fds_iemgr_alias_read_file(mgr, (string(path) + "/" + string(name) + "/aliases.xml").c_str());

src/iemgr/iemgr_alias.cpp

@@ -373,7 +373,7 @@ read_source(fds_iemgr_t *mgr, fds_xml_ctx_t *xml_ctx, fds_iemgr_alias *alias)
                 fds_iemgr_elem_find_name(mgr, cont->ptr_string);
             if (elem == nullptr) {
                 mgr->err_msg = "No element with name " + std::string(cont->ptr_string);
-                return FDS_ERR_NOTFOUND;
+                return FDS_ERR_FORMAT;
             }
             if (!alias_add_source(alias, elem)) {
                 mgr->err_msg = ERRMSG_NOMEM;