reset fcgi array in free_config

otherwise path, port and/or prog could become an invalid pointer.

gmid.c

@@ -328,6 +328,12 @@ free_config(void)
 		free(fcgi[i].path);
 		free(fcgi[i].port);
 		free(fcgi[i].prog);
+
+		fcgi[i].path = NULL;
+		fcgi[i].port = NULL;
+		fcgi[i].prog = NULL;
+
+		fcgi[i].s = FCGI_OFF;
 	}
 
 	tls_free(ctx);