ovsdb-server: Fix potential memory leak in parse_options().

When duplicate --config-file command-line arguments are passed,
the resources for previously specified file path were not freed.

This fix ensures unused resources are properly freed while
preserving the existing behavior of using the last configuration
file path specified.

Acked-by: Aaron Conole <aconole@redhat.com>
Acked-by: Roi Dayan <roid@nvidia.com>
Signed-off-by: Eelco Chaudron <echaudro@redhat.com>

ovsdb/ovsdb-server.c

@@ -2747,6 +2747,7 @@ parse_options(int argc, char *argv[],
             break;
 
         case OPT_CONFIG_FILE:
+            free(config_file_path);
             config_file_path = abs_file_name(ovs_dbdir(), optarg);
             add_default_db = false;
             break;