ecs_lookup fails after entity name was set to NULL

[sro5h]

Describe the bug
After changing the name of an entity to NULL and then back to the original name ecs_lookup can't find the entity anymore.

To Reproduce
Run the following example code:

#include "flecs/flecs.h"
#include <stdio.h>

int main(void) {
        ecs_world_t* w = ecs_init();

        ecs_entity_t e = ecs_new_id(w);
        ecs_set_name(w, e, "bob");

        if (ecs_lookup(w, "bob")) {
                printf("found entity 'bob'\n");
        }

        ecs_set_name(w, e, NULL);
        ecs_set_name(w, e, "bob");

        if (ecs_lookup(w, "bob")) {
                printf("found entity 'bob'\n");
        }

        return ecs_fini(w);
}

Expected behavior
Should print 'found entity 'bob'' twice.

Additional context
I'm on Fedora 36 compiling with gcc 12.2.1.

[SanderMertens]

Fixed!