[HACKERS] invalid number of sync standbys in synchronous_standby_names

Hi,

When the number of sync standbys is set to 0 in s_s_names, the assersion
failure happens as follows. This means that current multiple syncrep code
assumes that the num of sync standbys must be greater than 0. But we forgot
to forbid users from setting that num to 0. This is an oversight in multiple
syncrep patch (so my fault...). Attached patch forbits that.

TRAP: FailedAssertion("!(((bool) 0))", File: "syncrep.c", Line: 711)

Regards,

-- 
Fujii Masao

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