"maxretries" option of pg_standby doesn't work as expected

Hi,

> Set the maximum number of times to retry the copy or link command

maxretries option of pg_standby is documented as above, but actually
indicates the maximum number of times to *try* the copy or link command.
So, if "-r 0" is specified, pg_standby always fails.

Attached is the patch which adjusted the code so that maxretries actually
indicates the number of retry.

Comments?

--
Fujii Masao
NIPPON TELEGRAPH AND TELEPHONE CORPORATION
NTT Open Source Software Center