some problems with new locking code

I created simple table (just single int4 attr) with index on it
and tried to reproduce reported problems with BTP_CHAIN flag
(without success, unfortunately ?) by inserting data by 3-4 psql-s
simultaneously. No problems with 2 clients. But when 3rd psql
starts one of psql-s becomes blocked for long time (a minutes).
After some time blocked process may continue insertion but
another process is sleeping instead of wake-uped proc. The same
with 4 psql-s: one of process is always sleeping!

Thanks for finding this, Vadim. I had meant to re-run my locking tests
on the new code before the 6.3 final, but had not done it yet. I ran
them now, and they didn't work as they should. It is fixed now.

The problem was that I was incrementing a counter in a while conditional
test, even though I was not executing the loop, and the counter was used
in the next loop.

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