Lossy bitmap scan is broken in GIN

Hackers,

GIN hangs on lossy bitmap scan. Here is test case:

create extension btree_gin;
create table test as (select random() v from generate_series(1,1000000));
create index test_idx on test using gin(v);
set work_mem = '16MB';
select count(*) from test where v > 0.9;
count
───────
99916
(1 row)

Time: 63,142 ms

set work_mem = '64kB';
select count(*) from test where v > 0.9;

The last query hangs. I've debugged it. It's another bug in this "cursed"
loop in entryGetItem. Fix is attached.

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With best regards,
Alexander Korotkov.