__builtin_clz(0) leads to undefined behaviour:
https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html

Set nr = 1 directly to avoid this.

Link: https://github.com/checkpoint-restore/criu/issues/470Signed-off-by: Radoslaw Burny <rburny@google.com>
Acked-by: Kirill Tkhai <ktkhai@virtuozzo.com>
Signed-off-by: Andrei Vagin <avagin@virtuozzo.com>