dump: Don't shadow the ret code with dump_namespaces

cr_dump_tasks does assign ret = -1 by default but
dump_namespaces does shadow this variable with own
error code so that if any subsequent calls will fail
we will not notice the error.
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Acked-by: Andrew Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

cr-dump.c

@@ -1420,8 +1420,7 @@ int cr_dump_tasks(pid_t pid, const struct cr_options *opts)
 		goto err;
 
 	if (opts->namespaces_flags) {
-		ret = dump_namespaces(pid, opts->namespaces_flags);
-		if (ret < 0)
+		if (dump_namespaces(pid, opts->namespaces_flags) < 0)
 			goto err;
 	}