src/server_config.c: fix for - explicit null dereferenced

Author: jsc-se

src/server_config.c

@@ -2629,7 +2629,7 @@ nc_server_config_endpoint_reference(const struct lyd_node *node, enum nc_operati
             /* listen */
             free(endpt->referenced_endpt_name);
             endpt->referenced_endpt_name = NULL;
-        } else {
+        } else if (ch_endpt) {
             /* call home */
             free(ch_endpt->referenced_endpt_name);
             ch_endpt->referenced_endpt_name = NULL;
@@ -2657,7 +2657,7 @@ nc_server_config_endpoint_reference(const struct lyd_node *node, enum nc_operati
             free(endpt->referenced_endpt_name);
             endpt->referenced_endpt_name = strdup(lyd_get_value(node));
             NC_CHECK_ERRMEM_GOTO(!endpt->referenced_endpt_name, ret = 1, cleanup);
-        } else {
+        } else if (ch_endpt) {
             free(ch_endpt->referenced_endpt_name);
             ch_endpt->referenced_endpt_name = strdup(lyd_get_value(node));
             NC_CHECK_ERRMEM_GOTO(!ch_endpt->referenced_endpt_name, ret = 1, cleanup);