[BUGS] PQdb() fails with coredump when PQconnectDB() passed invalid parameter.

[Trevor Inns]

version 7.4.5

using postgresql-7.4.5/src/test/examples/testlibpq as follows

"testlibpq hostname=shouldHaveUsedHostNotHostname"

fails with coredump

SunOS pluto 5.9 Generic_117171-07 sun4u sparc SUNW,Ultra-5_10

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